Current issue date: 6 March 2020 Original approval(s): Expiry date: 29 October 2022 ISO 9001 - 30 October 2001 Certificate identity number: 10225093

Certificate of Approval

This is to certify that the Management System of: Tenaris S.A. Société Anonyme Holding

29 avenue de la Porte-Neuve, L-2227 Luxembourg, R.C.S. Luxembourg B-85.203

has been approved by Lloyd's Register to the following standards:

ISO 9001:2015

Approval number(s): ISO 9001 – 00011232

This certificate is valid only in association with the certificate schedule bearing the same number on which the locations applicable to

this approval are listed.

The scope of this approval is applicable to:

Sales, product design and development, manufacture and service provision of steel bars, steel tubular products and accessories; sucker rods and accessories; gas cylinders; components; coating and end protectors. Development and provision of scientific and

technological research activities to support the steel industry.

Daniel Oliva Marcilio de Souza

Area Operations Manager - South Europe Issued by: Lloyd's Register Quality Assurance Srl

for and on behalf of: Lloyd's Register Quality Assurance Limited

Lloyd's Register Group Limited, its affiliates and subsidiaries, including Lloyd's Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Lloyd's Register'. Lloyd's Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd's Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract. Issued by: Lloyd's Register Quality Assurance Italy Srl, Via Cadorna, 69 20090 Vimodrone Italy for and on behalf of: Lloyd's Register Quality Assurance Limited, 1 Trinity Park, Bickenhill Lane, Birmingham B37 7ES, United Kingdom Page 1 of 12

Certificate identity number: 10225093

Certificate Schedule

Location Activities

Tenaris HQ ISO 9001:2015

Dr. Simini 250 Quality Management System Head Quarters.

B2804MHA Campana, Buenos Aires

Argentina

Tenaris Product Development ISO 9001:2015 Dr. Simini 250 Design and development activities for Premium Connections and other type of tubular products. B2804MHA Campana - Buenos Aires ISO 9001 – 00011232-053 Argentina

Tenaris ISO 9001:2015

Siderca (Siderca S.A.I.C.) Sales, manufacture and service provision of steel bars, hot Dr. Simini 250, rolled and cold drawn seamless steel tubular products and accessories and end protectors. B2804MHA Campana - Buenos Aires ISO 9001 – 00011232-005

Argentina

Tenaris ISO 9001:2015 REDE-Argentina (Testing and Technical Solutions.ar S.A.) Development and provision of scientific and technological research activities to support the steel industry. Dr. Simini 250, ISO 9001 – 00011232-085

B2804MHA Campana,Buenos Aires,

Argentina

Tenaris ISO 9001:2015

Villa Mercedes (Metalmecanica S.A.) Sales, manufacture, design and technical support services Ruta Prov. 55 - Km 754.1 for steel sucker rods and accessories; hollow rods, polished rods, sinker bars, sucker rods guides, steel tube (5730) Villa Mercedes, San Luis lining and end protectors.

Argentina ISO 9001 – 00011232-009

Lloyd's Register Group Limited, its affiliates and subsidiaries, including Lloyd's Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Lloyd's Register'. Lloyd's Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd's Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract. Issued by: Lloyd's Register Quality Assurance Italy Srl, Via Cadorna, 69 20090 Vimodrone Italy for and on behalf of: Lloyd's Register Quality Assurance Limited, 1 Trinity Park, Bickenhill Lane, Birmingham B37 7ES, United Kingdom Page 2 of 12

Certificate identity number: 10225093

Certificate Schedule

Location Activities

Tenaris ISO 9001:2015

Villa Mercedes (Metalmecanica S.A.) Manufacture of hot rolled steel bars.

Ruta Nac. 7, Km 701 ISO 9001 – 00011232-047

(5730) Villa Mercedes, San Luis

Argentina

Tenaris ISO 9001:2015

Siat Valentin Alsina (Siat S.A.) Manufacture of welded steel tubes.

Guatemala 3400 ISO 9001 – 00011232-011

1822 Valentin Alsina Buenos Aires

Argentina

Tenaris ISO 9001:2015

Siat Villa Constitucion (Siat S.A.) Sales and manufacture (including coating application) of Ruta Provincial nr. 21 steel welded tubular products.

ISO 9001 – 00011232-045 Km 49, 2919 Santa Fe,

Argentina

Tenaris ISO 9001:2015

Scrap Service S.A. Reception, Processing and Sales of Ferrous Materials. Avda. General Savio 4655 Recycling of Vehicles and Sales of Related Services. Ciudad de Córdoba - Provincia de Córdoba, ISO 9001 – 00011232-094

Argentina

Tenaris ISO 9001:2015

Scrap Service S.A. Reception, Processing and Sales of Ferrous Materials. Ruta 6 Km. 203,436 Recycling of Vehicles and Sales of Related Services.

ISO 9001 – 00011232-095 Campana - Provincia de Buenos Aires,

Argentina

Tenaris ISO 9001:2015

Scrap Service S.A. Reception, Processing and Sales of Ferrous Materials. Ruta 8 Km 18 N° 4846, Recycling of Vehicles and Sales of Related Services. ISO 9001 – 00011232-096

San Martín- Provincia de Buenos Aires, Argentina

Lloyd's Register Group Limited, its affiliates and subsidiaries, including Lloyd's Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Lloyd's Register'. Lloyd's Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd's Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract. Issued by: Lloyd's Register Quality Assurance Italy Srl, Via Cadorna, 69 20090 Vimodrone Italy for and on behalf of: Lloyd's Register Quality Assurance Limited, 1 Trinity Park, Bickenhill Lane, Birmingham B37 7ES, United Kingdom Page 3 of 12

Certificate identity number: 10225093

Certificate Schedule

Location Activities

Tenaris ISO 9001:2015

Scrap Service S.A. Reception, Processing and Sales of Ferrous Materials. Ruta de la Tradición 7424 Recycling of Vehicles and Sales of Related Services. Esteban Echeverría - Provincia de Buenos Aires, ISO 9001 – 00011232-097

Argentina

Tenaris ISO 9001:2015

Confab Sucker Rods (Tenaris Confab Hastes de Bombeio S.A.) Sales, manufacture and technical support services for Rua Dr. Gonzaga, s/n steel sucker rods and accessories, polished rods, sucker rods guides and sinker bars. (12440-200) Moreira Cesar Pindamonhangaba,

ISO 9001 – 00011232-077 São Paulo,

Brazil

Tenaris ISO 9001:2015 Confab (Confab Industrial S.A.) Manufacture and service provision of welded carbon and Av. Gastao Vidigal Neto 475 micro alloyed steel tubes coated and uncoated and (12414-020) Cidade Nova Pindamonhangaba, structural tubes.Storage and distribution of pipes and São Paulo, supply services of inspections of pipes. Brazil ISO 9001 – 00011232-030

Tenaris

Tamsa (Tubos de Acero de México, S.A.) ISO 9001:2015 Carretera México - Veracruz Vía Xalapa Km. 433.7 Sales, manufacture and service provision of steel bars, hot (91697) Veracruz, Veracruz rolled and cold drawn seamless steel tubular products and

México accessories and end protectors.

ISO 9001 – 00011232-010

Tenaris ISO 9001:2015

Tamsa Sucker Rods (Tubos de Acero de Mexico, S.A.) Sales, manufacture and service provision of sucker rods Carretera México - Veracruz Vía Xalapa Km. 433.7 and accessories, sucker rods guides and sinker bars. (91697) Veracruz, Veracruz ISO 9001 – 00011232-091

México

Lloyd's Register Group Limited, its affiliates and subsidiaries, including Lloyd's Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Lloyd's Register'. Lloyd's Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd's Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract. Issued by: Lloyd's Register Quality Assurance Italy Srl, Via Cadorna, 69 20090 Vimodrone Italy for and on behalf of: Lloyd's Register Quality Assurance Limited, 1 Trinity Park, Bickenhill Lane, Birmingham B37 7ES, United Kingdom Page 4 of 12

Certificate identity number: 10225093

Certificate Schedule

Location Activities

Tenaris ISO 9001:2015 REDE-Mexico (Testing and Technical Solutions, S.A. de Development and provision of scientific and technological

C.V.) research activities to support the steel industry.

Carretera México - Veracruz Vía Xalapa Km. 433.7 ISO 9001 – 00011232-086

(91697) Veracruz, Veracruz

México

Tenaris ISO 9001:2015

División Conexiones (Tubos de Acero de México S.A.) Sales and manufacture of seamless steel buttweld fittings

Carretera Monterrey – Laredo Km 24.2 ISO 9001 – 00011232-039.

(65550) Ciénega de Flores, Nuevo León México. Tenaris

TuboCaribe (Tenaris TuboCaribe LTDA) ISO 9001:2015 Parque Industrial Carlos Velez Pombo KM 1 Sales and manufacture (including coating application) of Via Turbaco steel tubular products and accessories.

ISO 9001 – 00011232-058. Cartagena, Bolivar

Colombia

Tenaris ISO 9001:2015

Santa Cruz de la Sierra (Tenaris Global Services de Bolivia S.A.) Sales, service provision and storage of steel tubular Km. 23, Carretera al Norte - Zona Franca products and accessories.

ISO 9001 – 00011232-022. Santa Cruz de la Sierra,

Bolivia

Tenaris Global Services Venezuela ISO 9001:2015 (Socominter S.A.) Sales, service provision and storage of steel tubular Av. La Estancia Edificio La General, 9th floor products and accessories.

ISO 9001 – 00011232-069.

1061 Chuao, Caracas ,Venezuela

Tenaris ISO 9001:2015 Quito (Tenaris Global Services Ecuador S.A.) Sales, service provision and storage of steel tubular Av. 12 de Octubre N26-97, Oficina 202 products and accessories.

Edificio Torre 1492 ISO 9001 – 00011232-021 Quito,Ecuador

Lloyd's Register Group Limited, its affiliates and subsidiaries, including Lloyd's Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Lloyd's Register'. Lloyd's Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd's Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract. Issued by: Lloyd's Register Quality Assurance Italy Srl, Via Cadorna, 69 20090 Vimodrone Italy for and on behalf of: Lloyd's Register Quality Assurance Limited, 1 Trinity Park, Bickenhill Lane, Birmingham B37 7ES, United Kingdom Page 5 of 12

Certificate identity number: 10225093

Certificate Schedule

Location Activities

Tenaris ISO 9001:2015

Machachi (Tenaris Ecuador S.A.) Threading of casing and tubing Steel pipes, service Panamericana Sur Km 16.2 y Camino a San Alfonso provision and storage of tubular products and accessories. Via a Machachi ISO 9001 – 00011232-093

Machachi, Pichincha

Ecuador

Tenaris ISO 9001:2015

Montevideo (Tenaris Global Services S.A.) Order documentation and logistic management for Luis A. de Herrera 1248 distribution of steel pipes and accessories. Edificio Plaza - World Trade Center ISO 9001 – 00011232-041

11300 Montevideo

Uruguay

Tenaris ISO 9001:2015

Nisku (Hydril Canadian Company Limited Partnership) Sales, manufacture and service provision of steel tubular 2307 8th Street, products and accessories.

ISO 9001 – 00011232-052 Nisku, Alberta, T9E 7Z3,

Canada

Tenaris ISO 9001:2015 Calgary (Tenaris Global Services) Sales, service provision and storage of steel tubular 400, 530-8th Ave SW products and accessories.

Calgary, Alberta T2P 3S8 ISO 9001 – 00011232-070

Canada

Tenaris ISO 9001:2015 Prudential (Prudential Steel Ltd.) Manufacture of welded steel tubes.

8919 Barlow Trail SE ISO 9001 – 00011232 Calgary, Alberta T2C 2N7

Canada

Tenaris ISO 9001:2015 Algoma Tubes (Algoma Tubes Inc.) Manufacture and service provision of steel tubular 547 Wallace Terrace, products and accessories.

Sault Ste. Marie, Ontario, P6C 1L9 ISO 9001 – 00011232 - 037

Canada

Lloyd's Register Group Limited, its affiliates and subsidiaries, including Lloyd's Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Lloyd's Register'. Lloyd's Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd's Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract. Issued by: Lloyd's Register Quality Assurance Italy Srl, Via Cadorna, 69 20090 Vimodrone Italy for and on behalf of: Lloyd's Register Quality Assurance Limited, 1 Trinity Park, Bickenhill Lane, Birmingham B37 7ES, United Kingdom Page 6 of 12

Certificate identity number: 10225093

Certificate Schedule

Location Activities

Tenaris ISO 9001:2015

McCarty (Hydril Company) Manufacture and service provision of steel tubular products and accessories. McCarty Drive 302, Houston, TX, 77029,

ISO 9001 – 00011232-040 United States

Tenaris ISO 9001:2015 Subsea Center (Tenaris Coiled Tubes, LLC) Sales, manufacture and services provision of steel coiled No.2001, Kunlun Shan South Road tubing. Eco & Tech Development Zone, Qingdao City, ISO 9001 – 00011232 -065

PR China

Tenaris ISO 9001:2015 Downhole Center (Tenaris Coiled Tubes, LLC) Sales, manufacture and services provision of coiled 8615 East Sam Houston Parkway North tubular products.

Houston TX 77044 ISO 9001 – 00011232-064

USA

Tenaris ISO 9001:2015 Bay City (Tenaris Bay City Inc.) Manufacture and Service provision of hot rolled seamless 7960 SH-35 steel tubular products.

Bay City, TX 77414 ISO 9001 – 00011232-088

USA

Tenaris ISO 9001:2015 Conroe (Maverick Tube Corporation) Manufacture and Service provision of steel tubular 699 FM 3083 products. Conroe, TX 77301 ISO 9001 – 00011232-099

USA

Tenaris ISO 9001:2015 Houston (Tenaris Global Services (USA) Corporation) Sales and service provision of steel tubular products and 2200 West Loop South, Suite 800 accessories.

Houston, Texas 77027 ISO 9001 – 00011232-026

USA

Lloyd's Register Group Limited, its affiliates and subsidiaries, including Lloyd's Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Lloyd's Register'. Lloyd's Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd's Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract. Issued by: Lloyd's Register Quality Assurance Italy Srl, Via Cadorna, 69 20090 Vimodrone Italy for and on behalf of: Lloyd's Register Quality Assurance Limited, 1 Trinity Park, Bickenhill Lane, Birmingham B37 7ES, United Kingdom Page 7 of 12

Certificate identity number: 10225093

Certificate Schedule

Location Activities

Tenaris ISO 9001:2015 Rods (USA) Inc Manufacture and Service Provision of Sucker Rods and 188 FM 3083, Accessories .

Conroe, TX 77301 ISO 9001 – 00011232-100 USA

Tenaris ISO 9001:2015 Hickman (Maverick Tube Corporation) Manufacture (including coating application) of steel welded 5010 North County Road 967 tubular products.

Blytheville, AR 72315 ISO 9001 – 00011232-055

USA

Tenaris ISO 9001:2015 Bakersfield (Hydril Company) Manufacture and service provision of steel tubular 3237 Patton Way products and accessories.

Bakersfield, CA 93308-5717 ISO 9001 – 00011232-062 USA

Tenaris ISO 9001:2015 Dalmine (Dalmine S.p.A.) Sales, manufacture and service provision of steel bars, hot Piazza Caduti 6 Luglio 1944, 1 rolled seamless steel tubular products and accessories. Sales, product design, manufacture and service provision 24044 Dalmine () – Italy of gas cylinders. ISO 9001 – 00011232-001

Tenaris ISO 9001:2015 Dalmine OCTG Accessories Center Manufacturing of OCTG and Mechanical Equipment and (Dalmine S.p.A.) Provision of Threading Service.

Via Friuli, 7/B ISO 9001 – 00011232-084

24044 Dalmine (Bergamo) – Italy

Tenaris ISO 9001:2015 Piombino(Dalmine S.p.A.) Manufacture (including coating application) of seamless Località Ischia di Crociano steel tubular products.

57025 Piombino (Livorno) ISO 9001 – 00011232-003

Italy

Lloyd's Register Group Limited, its affiliates and subsidiaries, including Lloyd's Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Lloyd's Register'. Lloyd's Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd's Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract. Issued by: Lloyd's Register Quality Assurance Italy Srl, Via Cadorna, 69 20090 Vimodrone Italy for and on behalf of: Lloyd's Register Quality Assurance Limited, 1 Trinity Park, Bickenhill Lane, Birmingham B37 7ES, United Kingdom Page 8 of 12

Certificate identity number: 10225093

Certificate Schedule

Location Activities

Tenaris ISO 9001:2015 (Dalmine S.p.A.) Manufacture of hot rolled and cold drawn seamless steel Via Piò, 30 tubular products and components.

24062 Costa Volpino (Bergamo) ISO 9001 – 00011232-089

Italy

Tenaris ISO 9001:2015 Arcore (Dalmine S.p.A.) Manufacture of hot rolled seamless steel tubular products Via A. Grandi, 100 and components.

20862 Arcore (Monza e della Brianza) ISO 9001 – 00011232-090

Italy

Tenaris ISO 9001:2015 Sabbio Bergamasco (Dalmine S.p.A.) Design and manufacture of steel gas cylinders.

Via , 2 ISO 9001 – 00011232-002

24044 Sabbio Bergamasco (Bergamo)

Italy

Tenaris ISO 9001:2015 Silcotub (S.C. Silcotub S.A.) Sales, manufacture and service provision of hot rolled and 93 Mihai Viteazu Blv, cold drawn seamless steel tubular products and 450131 Zalau, Salaj County accessories.

ISO 9001 – 00011232-042 Romania

Tenaris ISO 9001:2015 Calarasi (S.C. Silcotub S.A.) Sale and manufacture of steel bars.

ISO 9001 – 00011232-044

62 Prelungirea Bucuresti Road

910153 Calarasi, Calarasi County

Romania

Lloyd's Register Group Limited, its affiliates and subsidiaries, including Lloyd's Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Lloyd's Register'. Lloyd's Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd's Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract. Issued by: Lloyd's Register Quality Assurance Italy Srl, Via Cadorna, 69 20090 Vimodrone Italy for and on behalf of: Lloyd's Register Quality Assurance Limited, 1 Trinity Park, Bickenhill Lane, Birmingham B37 7ES, United Kingdom Page 9 of 12

Certificate identity number: 10225093

Certificate Schedule

Location Activities

Tenaris ISO 9001:2015 Campina Sucker Rods (S.C. Silcotub S.A.) Sales, manufacture and technical support services for 1 Orizontului Street steel sucker rods and accessories, polished rods and 105600, Campina, Prahova County sinker bars.

ISO 9001 – 00011232-074 Romania

Tenaris ISO 9001:2015 Aberdeen (Tenaris Global Services (UK) Limited) Sales and service provision of steel tubular products and Minto Avenue Altens Industrial Estate accessories.

Aberdeen AB 12 3JZ ISO 9001 – 00011232-036

Scotland

U.K.

Tenaris ISO 9001:2015 Badentoy (Tenaris Global Services (UK) Limited) Service provision and storage of steel tubular products and Badentoy Crescent, Badentoy Industrial Estate, accessories.

ISO 9001 – 00011232-098 Portlethen - Aberdeen, GB

Tenaris

Esbjerg (Tenaris Global Services Denmark) ISO 9001:2015 Måde Industrivej 38 Sales, manufacture and service provision of steel tubular DK-6705 Esbjerg Ø products and accessories.

Denmark ISO 9001 – 00011232-076

Tenaris ISO 9001:2015 Stavanger (Tenaris Global Services Norway AS) Sales, service provision and storage of tubular products Kanalsletta 3 and accessories.

ISO 9001 – 00011232-015 4033 Stavanger – Norway

Tenaris ISO 9001:2015 Onne (Tenaris Global Services Nigeria Ltd) Sales, manufacture and service provision of steel tubular Oil and Gas Freezone products and accessories.

Federal Lighter Terminal ISO 9001 – 00011232-019 Onne/Port Harcourt - Rivers State

Lloyd's Register Group Limited, its affiliates and subsidiaries, including Lloyd's Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Lloyd's Register'. Lloyd's Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd's Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract. Issued by: Lloyd's Register Quality Assurance Italy Srl, Via Cadorna, 69 20090 Vimodrone Italy for and on behalf of: Lloyd's Register Quality Assurance Limited, 1 Trinity Park, Bickenhill Lane, Birmingham B37 7ES, United Kingdom Page 10 of 12

Certificate identity number: 10225093

Certificate Schedule

Location Activities

Nigeria

Tenaris ISO 9001:2015 Cairo (Tenaris Global Services S.A.E.) Sales and service provision of steel tubular products and Plot no. 67, 90th Street, accessories.

First section, 6th floor, ISO 9001 – 00011232-063 City Center – New Cairo – Cairo -Egypt

Tenaris ISO 9001:2015 Dammam (Tenaris Saudi Arabia Ltd) Sales, manufacture and service provision of steel tubular 2nd Industrial City - PO BOX 12441 products and accessories.

Dammam 31473 - Eastern Province ISO 9001 – 00011232-067 Saudi Arabia

Tenaris ISO 9001:2015 Dubai (Tenaris Global Services) Sales and service provision of steel tubular products and Suites 2501 - 2505, 25th Floor, accessories.

Business Central Towers ISO 9001 – 00011232-012 Tower A, PO Box 27581

Dubai, U.AE.

Tenaris ISO 9001:2015 Aktau (Kazakhstan Pipe Threaders LLP) Sales, manufacture and service provision of steel tubular 130000 Mangystau Region, Aktau products and accessories.

Industrial zone Subzone #3 Building ABK ISO 9001 – 00011232-082

Kazakhstan

Tenaris ISO 9001:2015 Moscow (Tenaris Global Services S.A.) Sales and service provision of steel tubular products and Moscow Rep. Office accessories.

Voznesenskiy Lane 20, Stroyenie 3 ISO 9001 – 00011232-066

125009 Moscow - Russian Federation

Tenaris ISO 9001:2015 Qingdao (Tenaris Qingdao Steel Pipe Ltd) Sales, manufacture and service provision of steel tubular No. 2001 South Kunlun Shan Road, products and accessories.

Eco & Tech Development Zone, ISO 9001 – 00011232-048

Qingdao City, P.R China

Lloyd's Register Group Limited, its affiliates and subsidiaries, including Lloyd's Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Lloyd's Register'. Lloyd's Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd's Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract. Issued by: Lloyd's Register Quality Assurance Italy Srl, Via Cadorna, 69 20090 Vimodrone Italy for and on behalf of: Lloyd's Register Quality Assurance Limited, 1 Trinity Park, Bickenhill Lane, Birmingham B37 7ES, United Kingdom Page 11 of 12

Certificate identity number: 10225093

Certificate Schedule

Location Activities

Tenaris ISO 9001:201 5 NKKTubes (NKKTUBES) Sales, manufacture and service provision of hot rolled 2-1 Ikegami-cho Kawasaki-ku, seamless steel tubular products and accessories.

Kawasaki-shi, Kanagawa-ken, 210-0864 ISO 9001 – 00011232-038 Japan

Tenaris

REDE-Japan (NKK TUBES) ISO 9001:2015 2-1 Ikegami-cho Kawasaki-ku, Development and provision of scientific and technological Kawasaki-shi, Kanagawa-ken, 210-0864 research activities to support the steel industry.

Japan ISO 9001 – 00011232-087

Tenaris ISO 9001:2015 Batam (PT. Hydril Indonesia) Threading of casing and tubing steel pipes and Kabil Industrial Estate, JI. Hang accessories; sales, service provision and storage of Kesturi 1 Kav 23 & 24, Kabil Batam tubular products and accessories.

Riau Islands 29467 ISO 9001 – 00011232-054 Indonesia

Tenaris ISO 9001:2015 SPIJ (PT. Seamless Pipe Indonesia Jaya) Sales, manufacture and service provision of steel tubular products and accessories.

Krakatau Industrial Estate Cilegon ISO 9001 – 00011232-073

Banten Jl. Antartika I Kav. F4

42443 Cilegon

Indonesia

Tenaris ISO 9001:2015 Songkhla (Tenaris Global Services (Thailand) Ltd.) Service Provision and Supply of Steel Tubular Product and 15/21, Moo 2, Tambon Ching-Ko Accessories. 90280 Amphur Singhanakhon,Songkhla ISO 9001 – 00011232-092

Thailand

Lloyd's Register Group Limited, its affiliates and subsidiaries, including Lloyd's Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Lloyd's Register'. Lloyd's Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd's Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract. Issued by: Lloyd's Register Quality Assurance Italy Srl, Via Cadorna, 69 20090 Vimodrone Italy for and on behalf of: Lloyd's Register Quality Assurance Limited, 1 Trinity Park, Bickenhill Lane, Birmingham B37 7ES, United Kingdom Page 12 of 12