DOCSLIB.ORG

How to Make a BBQ Burner

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
How to Make a BBQ Burner instructables How to Make a BBQ Burner by MaxPower1977 For a DIY griddle project I'm working on I need a But a warningfirst, playing with propane is propane burner that will heat up the cooking surface, I dangerous, so if you decide to try this you do so at thought the build of the burner would make a good your own risk and peril. At minimum wear safety Instructable. Buying a burner was out of the question glasses, gloves and non-flammable clothing. Also do as the size and power I require is not available of the this in a very well ventilated area, outside or in an shelf. If you need to replace or repair a BBQ burner open garage, you don't want carbon monoxide this might help you as well. poisoning. How to Make a BBQ Burner: Page 1 Step 1: Materials and Tools This is what I used but other materials could be used as well depending on the application: 1" x 1/16" stainless steel tubing (could substitute this with regular steel but stainless will last longer) 3/4" to 1 1/2" black iron reducer fitting 1/8" brass NPT pipe nipple 1/8" brass NPT end cap 1/8" ball valve rated for gas 3/4" steel bar stock Low pressure BBQ regulator and hose (depending on how many burners you hook up you will need to increase the capacity of the regulator) Flare fitting to go from the propane hose to 1/8" NPT thread Propane Tank PTFE tape or pipe dope Tools: Drill and Drill bits Small Drill bits (1mm or 1.2mm) - you can get a set off amazon if you can't find them locally Tap and Die set (8-32 tap and 1/8" NPT tap) Welder with cast iron welding rods or MIG Welder with stainless steel wire (this makes things easier but it is possible to braze the parts together as well with a propane torch) Bandsaw or hacksaw Center punch Angle grinder with cutting disc How to Make a BBQ Burner: Page 2 Step 2: Theory and Design So lets talk about theory, at least in my layman's terms: This burner design works off the venturi effect, as gas is being forced out through a small orifice mounted at the end of the burner, it pulls air along and mixes inside the burner tube. The mixed propane and air then is forced out of the burner holes or slots and when ignited it burns. Propane needs to mix with air to burn at a specific ratio, but with trial and error I was able to get the burner to burn with a nice blue flame. If you get a flame with yellow or orange, it means that there is un-burnt fuel and not enough air has mixed with the propane to get proper combustion. The size of the orifice hole is very critical to the size of the tube, if the tube is too small and the orifice hole too large you get incomplete mixing and incomplete combustion. For this design I tested many different orfice holes, from: 1/32" - too small - very small blue flame 1/16" - too big - lots of yellow but a very powerful flame 0.8 mm - too small 1.0 mm - just right - no yellow flame 1.2 mm - just right with a bit of yellow but a very strong flame I landed on a 1.2 mm orifice hole. Step 3: Video of the Construction of Burner Check out the video for how I build the burner, the written steps follow: //www.youtube.com/embed/ar6NGXjNRJI How to Make a BBQ Burner: Page 3 Step 4: Orifice Assembly The orifice assembly is made from 1/8" brass NPT pipe nipple (length is dependent on the application) 1/8" brass NPT end cap 1/8" ball valve rated for gas 3/4" steel stock The center of the 1/8" brass NPT end cap was center punched and then drilled out using a 1.2mm drill bit, cutting oil was used too. This hole is the orifice and propane will flow out from this hole at high velocity. Also pro-tip, if the drill bits are too small for the chuck of your drill use some metal tape and wrap it around the drill bit so it will make the shaft large enough to be grabbed by the chuck. Center punch the 3/4" steel stock and drill a hole that corresponds to the 1/8" NPT tap. Using lots of cutting oil cut threads into the hole. This hole will thread the 1/8" brass NPT pipe nipple. Once the pipe nipple has been threaded through the hole, cap off the opening of the tube with the cap that has the orifice hole drilled in from a previous step. Thread the ball valve onto the other end of the nipple. Be sure to ensure a leak free seal between all the fittings by using PTFE tape or pipe dope to seal the threads. 1 2 1 1. 1/8" NPT Tap 1. 1/8" NPT Tap 2. 1/8" NPT short pipe nipple How to Make a BBQ Burner: Page 4 1 1. 1.2 mm hole drilled into 1/8" NPT brass cap 1 1. The assembled unit How to Make a BBQ Burner: Page 5 Step 5: Building the Burner Tube The body of the burner is made from a piece of this could be brazed and the holes could be tapped stainless steel tubing, stainless is really hard to work directly into the end of the reducer fitting. I chose to with as it work hardens. I first was going to drill burner weld on some tabs as it made it easier to work with. holes in it but it would take far too long and far too much work so I decided I would cut small thin slots in A note about welding the black iron reducer fitting: the tube spaced 1cm apart for the burner "holes". I these fittings are typically cast iron which do not weld used my portable bandsaw and made short work of very well or easy. Since I am just tack welding, it's not this but a hack saw could be used too. really an issue, also the cast iron should be preheated before welding. I am using a MIG welder The end of the stainless steel tube was heated and with stainless steel wire, which I have heard that can then bent closed in a vice. This allows the burner tube be used to welding cast iron. So far I have had no to be crimped and "capped" off, making a flat spot issues with cracking. A nickle welding rod can be where a hole can be drilled and used for mounting the used too. burner. The end of the tube was welded shut after crimping (this could be brazed as well). Line up the orifice of the orifice assembly so it's in the middle of the 1 1/2" opening of the reducer fitting, you Next the tube was welded on to the 3/4" to 1 1/2" want the propane to shoot straight down the burner black iron reducer fitting, the reducer fitting makes for tube so it can mix with air, clamp in place and mark a great burner intake for air and mount for the orifice. the holes with a marker. Holes were drilled into the Two 3/4" steel tabs were welded on to the sides of orifice assembly that match the steel tabs with the the reducer that were tapped with a hole (3-32 bolts is tapped holes so the orifice assembly could be bolted what I used) to accept a bolt for mounting the orifice to the reducer fitting. assembly. Again if you don't have access to a welder 2 1 1 1. Slots were cut into the 1" stainless steel tube. 1. Slots cut 2. End was heated and crimped shut in a vise. How to Make a BBQ Burner: Page 6 1 1. The crimped end was welded closed. 1 1. 1 1/2" to 3/4" pipe reducer had tabs welded on each side. How to Make a BBQ Burner: Page 7 1 1. The tabs were tapped to accept a 8-32 bolt. 1 1 1. Cast iron was preheated to prevent cracking before welding.. 1. Tacked welded in place. How to Make a BBQ Burner: Page 8 1 1. Stainless steel wire was used or a nickle based rod for cast iron. Step 6: Hooking It Up and Testing To hook up the burner to the propane I used a fitting before testing. that went from the flare fitting on the propane hose and regulator to 1/8" NPT threads, in my case the ball Turn on the propane on the tank and open the ball valve. This will depend on the fitting you used so just valve 1/4 of a turn ,you should hear gas flowing, using use what I have done as a guideline, check your local a BBQ lighter ignite the gas flowing from the slits cut area for a propane supplier or fitting shop and they in the burner tube. The whole burner should light, if it will be able to get the proper fittings for you. doesn't turn up the flow of gas. There should be a nice blue flame if everything is working properly. The propane regulator I used was low pressure one Trying adjusting the flow of gas and see if the flame is for a BBQ, it needs to be large enough to handle the burning correctly, it should be blue when turned up capacity of the number of burners, in this case I sized low or high.
Load more

Recommended publications
  • Stainless Steels for Machining
    STAINLESS STEELS FOR MACHINING A DESIGNERS’ HANDBOOK SERIES NO 9011 Produced by Distributed by AMERICAN IRON NICKEL AND STEEL INSTITUTE INSTITUTE STAINLESS STEELS FOR MACHINING A DESIGNERS’ HANDBOOK SERIES NO 9011 Originally, this handbook was published in 1985 by the Committee of Stainless Steel Producers, American Iron and Steel Institute. The Nickel Institute republished the handbook in 2020. Despite the age of this publication the information herein is considered to be generally valid. Material presented in the handbook has been prepared for the general information of the reader and should not be used or relied on for specific applications without first securing competent advice. The Nickel Institute, the American Iron and Steel Institute, their members, staff and consultants do not represent or warrant its suitability for any general or specific use and assume no liability or responsibility of any kind in connection with the information herein. Nickel Institute [email protected] www.nickelinstitute.org TABLE OF CONTENTS Page Preface .................................................................................................... 2 Introduction to Stainless Steels ............................................................ 4 Identification ...................................................................................... 4 Corrosion Resistance ......................................................................... 9 High-Temperature Corrosion Resistance ......................................... 19 Mechanical
    [Show full text]
  • 535 Manual Chuck/535 Auto Chuck Threading Machines
    Threading Machine Manual 535 Manual Chuck/535 Auto Chuck Threading Machines • Français – 23 • Castellano – pág. 49 Find Quality Products Online at: www.GlobalTestSupply.com [email protected] 535 Manual Chuck/535 Auto Chuck Threading Machines Table of Contents Recording Form For Machine Serial Number ............................................................................................................1 Safety Symbols..............................................................................................................................................................2 General Power Tool Safety Warnings Work Area Safety ........................................................................................................................................................2 Electrical Safety ..........................................................................................................................................................2 Personal Safety ..........................................................................................................................................................3 Power Tool Use And Care ..........................................................................................................................................3 Service........................................................................................................................................................................3 Specific Safety Information Threading Machines Safety Warnings ........................................................................................................................4
    [Show full text]
  • Cutoff Lathes and Endfinishers Brochure
    Rotating-Head Cutoff Lathes Tube Loading & Endfinishing Systems • Rugged high-speed cutting, grooving, turning and chamfering • More parts per hour, closer tolerances, reduced labor • Fastest changeover • OD/ID chamfers in a single chucking, both ends • Models for round tubing up to 9" diameter, barstock to 3" HAUT-025RCBrochure2RS.indd 2 1/27/10 1:29:15 PM Our History and Our Commitment to You … Hautau is our family name. It is on every machine we build. That’s why we’ll stand behind you on every one 24/7. Hautau makes world-class tube cutoff machines and systems. They are designed, engineered and built by American craftsmen in the fields of southeast Indiana. Charles F. Hautau Sr, company founder, was a gifted inventor who held over 60 patents including rotary-head cutoff and CNC tube bending. Charles Jr. and Fred have carried on the tradition, building a wide range of innovative machinery for over forty years. Among our early machines was one to trim the ends of mufflers. Because the muffler Charlie Hautau could not spin, our design featured a rotating head. After twenty years of building tube cutting and processing machines and other custom automation, we decided to apply the rotating head concept to cutting thick wall steel tubing. This would form the basis for our standard product line. Traditional tube cutoff lathes have a headstock with a through hole up to two feet deep, so tube feeding methods are limited. The tube can be machined on just one end. Short cuts can fly out and long cuts need outboard support rollers.
    [Show full text]
  • Click for Table of Contents
    ASCO CLICK FOR TABLE OF CONTENTS ISO 9001 DETROIT-WAYNE Based Business ISO 14001 ABOUT US Welcome to Aluminum Supply Co. Established in 1948, Aluminum Supply Company is committed to providing only the highest quality metal supplies to a wide variety of customers. Our experienced and friendly staff is knowledgeable in all areas of our inventory and always takes the time to pay attention to all our customers’ questions and concerns. Our two divisions maintain a large inventory of extrusions and products The Marshall Brothers - 1950s commonly used in the commercial construction industry. Our sister company, Marshall Sales, Inc., distributes an extensive variety of fasteners. Creating your vision in metal since 1948 Warehouse Division Our Warehouse Division maintains a large inventory of aluminum extrusions which are listed in this catalog. ASCO’s most common shapes include square, round and rectangular tubes, angles, channels, solid rod, and bar stock. Many of the shapes are available in anodized or mill finish. Other sizes and/or alloys are available upon request. Fabrication Division The Sheet Metal Fabrication Division specializes in products commonly used in the commercial construction industry. These products include fascia and coping systems, gutters, downspouts, other metal roofing accessories, panel systems, and various trim pieces. ASCO also offers custom fabrication, laser cutting, welding, CAD drawings, and much more. www.AluminumSupply.com i LOCATION 696 M5 M10 75 275 ASCO 96 DETROIT 94 Aluminum Supply Co. ASCO is located in
    [Show full text]
  • FEIN METAL CORE DRILLING User-Oriented Solutions from the Specialist
    FEIN METAL CORE DRILLING User-oriented solutions from the specialist FEIN • SLUGGER Core Drilling Units Hand-Held Core Drill FEIN System Expertise Quickin System Tappers HSS Annular Cutters Carbide Cutters Accessories CONTENTS Table Of Contents General Core Drilling Units Cutters & Accessories Additional Core Drill Overview 4 KBM 32 Q 6 KBM Accessories 9 FEIN Tappers 14 KBM Premium Line 5 KBM 50 QX 7 KBM QUICKIN Cutters 11 FEIN Product Line 31 KBB Standard Line 15 KBM 52 U 6 KBH Hand-held 12 KBM 80 AUTO 7 Slugger Cutters 19 FEIN Warranty 32 Why FEIN QUICKIN? 11 HSS Nova 20 KBB 30 16 Slugger Cutter Line 19 HSS Dura TiN 22 KBB 38 16 HM Ultra Carbide 23 FEIN System Expertise KBB 40 17 Tap Size 24 “FEINOLOGY” 3 KBB 60 17 Sheet Metal 26 Slugger Accessories 25 FEIN Brand 3 KBH 25 12 Industrial Arbors 28 FEIN Mobile Training 32 ShortSluggers 30 FEIN KBM Premium Series: Core drilling system with high quality standards for versatile applications and optimum speed for carbide cutters. FEIN KBB Standard Series: Ideal for workshop and installation jobs. Reliable and economical with optimum speed for HSS annular cutters. FEIN KBH Hand-held: Drilling reinvented with the world’s first hand-held metal core drilling system. FEIN SYSTEM EXPERTISE Profit from FEIN system expertise. No other power tool manufacturer offers you as much experience in the core drilling field. FEIN knowledge has been built up over decades, and built into every aspect of FEIN core drilling. Introducing FEIN offers you a core drilling system for metal in which machine, core bits, and accessories are precisely matched to each other.
    [Show full text]
  • S181 Bar Stock Milling/Turning Centre with Two Workstations
    s181 Bar stock milling/turning centre with two workstations Ken Otzel /President High Performance Machinery (508)958-5565 ~ [email protected] 2 s181 MORE THAN COST- EFFECTIVE PARTS The s181 product line combines the best "Swiss made" expertise with a high degree of innovation. With its double machining station concept, a 30,000 rpm spindle (40,000 rpm as an option) and an extensive tool capacity, the s181 produces extremely complex parts from bar up to 32 mm in diameter. A mineral cast frame, the latest generation numerical control and linear motors ensure uncompromising thermal stability and performance. Whether you are producing watch parts, surgical implants or instruments, the s181 represents a major asset in helping you overcome current and future market challenges. Watch-Making Medical Micro-Mechanics Electronics SWISS M ADE s181 An innovative concept to boost productivity by up to 40% thanks to simultaneous operations on 2 workstations. 2 machining stations Machine holds up to 90 tools Tool change time < 1.1 s 30,000 rpm tool speed Linear drives 5 simultaneous axes Combined milling/turning CNC FANUC 31iB-5 control Footprint < 4 m2 4 s181 STEP-BY-STEP PERFORMANCE Example: Surgical instrument Steel type: AISI 316L Bar diameter: 14 mm Number of tools: 14 0 1 2 3 4 5 6 7 Single spindle machining centre s181 144’’ 38% 399’’ higher productivity 244’’ 144’’ 244’’ 255’’ 11’’ 11’’ Production cycle : 6’39’’ Production cycle : 4’15’’ Sectioning Bar operations Pickup operation Time savings Production times were measured during production of a high quality endoscopy forceps. AREAS OF APPLICATION DENTAL WATCH-MAKING Implant Bracelet links MEDICAL JEWELLERY PEEK cage MAKING Rings 38% higher productivity AEROSPACE ORTHOPAEDICS Injector Bone plate INSTRUMENT WATCH-MAKING Endoscopy forceps Watch case 6 s181 ELECTROSPINDLE - Attachment: HSK-T/E40 or Capto C4 - Max.
    [Show full text]
  • Primary Structural Steel Frame Components Metal Building Manufacturers Association Industry-Wide Epd
    ENVIRONMENTAL PRODUCT DECLARATION PRIMARY STRUCTURAL STEEL FRAME COMPONENTS METAL BUILDING MANUFACTURERS ASSOCIATION INDUSTRY-WIDE EPD The Metal Building Manufacturers Association (MBMA), Cleveland, Ohio , w a s founded in 1956. Since that time, MBMA and its manufacturer members have worked together as partners to further its mission: to conduct research, to help advance building codes and standards, and to educate the construction community. MBMA’s passion is to support a strong, sustainable metal building systems industry that meets the needs of building owners an d s o c i e t y . MBMA's members are deeply committed to the social, environmental and economic principles of sustainability. This pledge is aimed at improving the quality of life for everyone now without compromising the ability of future generations to meet the i r n e e d s . T h i s i n d u s t r y -a v e r a g e EPD includes only t h e Primary Structural Steel Frame Co m p o n e n t s used in metal building systems. These components serve as the load carrying columns and beams of a metal building system. Separate EPDs are available that addr e s s t h e s e c ondary structural steel framing a n d the exterior metal roof and wall panel cladding used to form a complete metal building system. T h i s i n d u s t r y -a v e r a g e EPD is representative of the MBMA Metal Building S y s t e m s m e m b e r s .
    [Show full text]
  • 1.4 METAL CUTTING BAND SAWS: Metals Can Be Bought From
    INTRODUCTION TO MACHINING 1.4 METAL CUTTING BAND SAWS: Metals can be bought from suppliers in standardized forms and sizes, such as round, rectangular or square bar stock or in the form of large sheets (plates). Bar stock normally is available in lengths of up to 4 [m], sheets in dimensions up to 1.2 [m] x 2.4 [m]. This means that for most “jobs” the bar stock needs to be cut to length; this is normally done using band saws. Sheets are pre-cut using flame or plasma cutting machines or shearing machines and can then be further cut using band saws. There are two types of band saws used for cutting metal: the vertical band saw and the horizontal cut-off saw. 38 INTRODUCTION TO MACHINING 1.4.1 Vertical band saw: It is used to cut metal plate to a required approximate size, the so-called “blank”, which is then converted into the final product using machines such as the Mill, the Drill Press or the Lathe. Bar stock can be cut on a vertical band saw, but the preferred machine is the horizontal band saw. A continuous blade runs in a vertical plane, in a clock- wise direction. Most of it is hidden inside the housing of the machine and only a small part (slightly more than the thickness of the material to be cut) is exposed between the table and the bottom end of the blade guard. The blade guard can be raised or lowered by loosening and tightening the guard adjustment knob. The work-piece must be resting on, and be fully supported by the table; do not cut round bar stock in this type of saw, unless you are using a machining vise to hold the bar.
    [Show full text]
  • Firearms Firearms Machining: GARIA® 2600 M-12 US Transforms Plant Economics
    Case Study: Firearms Firearms Machining: GARIA® 2600 M-12 US Transforms plant economics The Unique Challenge The Houghton Approach An industry leading US firearms manufacturer, specializing in To address production improvement goals, Houghton the precision manufacturing of the most accurate and recommended using GARIA® 2600 M-12 US, a chlorine-free, dependable quality rifle barrels, was searching for low viscosity cutting oil, to replace the high viscosity opportunities to continually improve plant economics. chlorinated oil in use in critical gun drilling and reaming The plant’s primary applications included gun drilling, operations. The trial produced exciting results. reaming, and CNC machining. The plant manager was particularly targeting the gun drilling operation: Gun drilling operational improvements: Equipment: Pratt & Whitney 2-Barrel horizontal gun drill Productivity increased 87%: Feed rate increased from machines. Bar stock rotates as fixed drill is indexed into 1.5 to 2.5 inches per minute. Parts production increased bar stock from 1500 to 2800 barrels per 12 hour shift Tool: 4 foot long single flute carbide tipped drill Tool life increased 61%: Tool breakage went from 8 to Work pieces: 3 to 4 foot long alloy steels and 416 10 drills per 24 hours down to 3 to 4 drills in the same stainless steel bar stock time period Current cutting oil: high viscosity chlorinated straight oil Part quality improved: 67% improvement in center The primary objective was to raise the production rate by placement of gun barrel drill hole end-to-end. (Reduced increasing the feed rate. Total Indicator Reading from 0.030 to 0.010) Additionally, the gun drilling operations suffered from high Built Up Edge reduction: Significantly reduced number maintenance due to sticking pump valves, monthly pump of ID rings removed in the subsequent reaming process failures, and regular replacement of cutting oil due to build- Surface finish improved: Reaming operation produced up of tacky residue.
    [Show full text]
  • Client Reviews
    HEAVY DUTY DRILL BITS FOR METAL CLIENT REVIEWS 4.9 STARS www.ttp-hard-drills.com (UK) - www.ttp-hard-drills.net (USA) Our Client Reviews DRILLING RUSTED SCREW HEADS Good for drilling out rusted heads for lifting hardwood decking - very effective indeed. Malcolm DRILLING STAINLESS STEEL Hello there….I just thought I’d drop you a line commending your products. The 6,5,4 and 3 mm drill bits work a treat on my stainless steel cycle rack. Initially I ran the drills too fast and I didn’t use enough pressure which resulted in poor performance, particularly on the larger drill sizes. I quickly learned that slowing the drill down and increasing drill pressure whilst ensuring enough cutting grease had been applied enhanced the drilling performance immensely. It used to frighten me when drilling stainless steel. NOT ANY MORE! Well done your Company! Trevor Ball DRILLING EXHAUST MANIFOLD STUDS They are fabulous. I still haven’t had the time to use them for their actual intended purpose – drilling out exhaust manifold studs, but I did try them out on a couple of bolts to see how they did and was very impressed! Told a bunch of my friends about them. Hoping to get a joint order together. I want more sizes or one of the sets! R Scott Martin www.ttp-hard-drills.com (UK) - www.ttp-hard-drills.net (USA) Our Client Reviews DRILLING TENSILE BOLTS I was very happy with my purchase of the tough drill bits, they allowed me to drill out some broken off tensile bolts from a 25 year old motorbike cylinder head, failure in this would have meant finding a new head or abandoning the project.
    [Show full text]
  • Catalog25small.Pdf
    We dedicate this catalog back in. That was not the case. The office and plant areas of the building were completely destroyed. There was nothing to In memory of our father go back to. (Continued on page 150) Warren L. Fuller Guarantee It is with our deepest regrets that we inform you of the This catalog illustrates and describes all the types of loss of our father, Warren L. Fuller. His passing was due to Countersinks, Counterbores, Plug Cutters and Drills Hurricane Katrina as he was a resident of the Gulf Coast of manufactured under the name Fuller and fully guaranteed Mississippi. He survived and escaped the hurricane only to in normal use. The Fuller logo appears near each tool die of a heart attack one day later in a high school shelter picture manufactured by us. where he was waiting for his companion of 20 years. She had Also included are various types of drills, bits, cutters, and been injured during the escape and was hospitalized. We had specialty type tools, made by reputable American traveled to his town to rescue him and were only a few miles manufacturers, worthy of showing in our catalog. These are from him when he passed. As owner of W. L. Fuller, Inc., he to supplement our own line of tools and are also fully had prepared his children to continue with the same service guaranteed. and quality you have become accustom to. We look forward We have now added a few very useful types of tools that to continuing the business relationships he enjoyed and are just not available in this country.
    [Show full text]
  • STEEL SERVICE CENTERS Serving the U.S
    NEWEST LOCATION: HAMMOND, IN - NOW OPEN Since 1960 Laser cutting Plate and Long Products Beams-Channels-Angles-Pipe-Tube-Bar Stock-Sheet-Plate-Floor Plate AR Plate-Expanded Metal-Grating-Grip Strut-Rail-ReRod-Molded Cover Bar Tees-Threaded Rod-Galvanized Rounds, Angles, Channels-Processing and More! Detroit * Belleville * Grand Rapids Chicago * Cleveland STEEL SERVICE CENTERS Serving the U.S. and Canada Serving steel users for over 54 years INDEX www.contractorssteel.com AR Plate ................................................... 13 Angles ........................................................ 6 Bar Channels ................................................. 7 Channels ....................................................... 7 Cold Finished Strip ........................................... 5 Cold Finished Flat ............................................ 5 Cold Finished Rounds ........................................ 5 Cold Finished Squares ........................................ 5 Expanded Metal ................................................ 15 Floor Plate ......................................................... 9 Galvanized ....................................................... 16 Grating ....................................................... 15 Grip Strut ................................................. 15 Hot Rolled Rounds ........................................... 3 Hot Rolled Squares ......................................... 3 Hot Rolled Strips ............................................. 3 Hot Rolled Flats .............................................
    [Show full text]