GB/T 21237-2026 Wide and heavy plate for line pipe of petroleum and natural gas English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS
CCS
National Standard of the People's Republic of China
GB/T 21237-2026
Wide and heavy plate for line pipe of petroleum and natural gas
石油天然气输送管用宽厚钢板
Issue date: 2026-02-27 Implementation date: 2027-03-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Classification, designation method and codes
5 Ordering information
6 Manufacturing process
7 Technical requirements
8 Test methods
9 Inspection rules
10 Packaging, marking and quality certificate
Annex A (normative) Steel plates for sour service
Annex B (normative) Steel plates for submarine pipelines
Annex C (normative) Steel plates for pipe fittings
Annex D (normative) Steel plates for high deformability
Annex E (normative) Steel plates for induction-heated bends
Annex F (normative) Steel plates for station pipe
Annex G (normative) Method for evaluation of banded structure in acicular ferrite pipeline steel
Wide and heavy plates for oil and gas transmission pipelines
1 Scope
This document specifies the classification, designation method and codes, ordering information, manufacturing process, technical requirements, test methods, inspection rules, packaging, marking and quality certificate for wide and heavy plates for oil and gas transmission pipelines.
This document is applicable to hot-rolled wide and heavy plates (hereinafter referred to as "plates") with a thickness of 6 mm to 90 mm, mainly used for the manufacture of oil and gas transmission steel pipes (including induction-heated bends) and pipe fittings in conventional environments and special environments such as sour service, submarine and station service.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 223 (all parts), Methods for chemical analysis of iron, steel and alloy
GB/T 228.1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
GB/T 229, Metallic materials — Charpy pendulum impact test method
GB/T 232, Metallic materials — Bend test method
GB/T 247, General requirements for packaging, marking and quality certificate of steel plates and strips
GB/T 709-2019, Hot-rolled steel plates and strips — Dimensions, shapes, masses and tolerances
GB/T 2970, Method of ultrasonic testing for thick steel plates
GB/T 2975, Steel and steel products — Location and preparation of samples and test pieces for mechanical testing
GB/T 4157-2017, Laboratory testing of metals for resistance to sulfide stress cracking and stress corrosion cracking in H₂S environments
GB/T 4160, Test method for strain ageing sensitivity of steel (Charpy impact method)
GB/T 4336, Carbon steel and low-alloy steel — Determination of multi-element contents — Spark discharge atomic emission spectrometric method (routine method)
GB/T 4340.1, Metallic materials — Vickers hardness test — Part 1: Test method
GB/T 6394, Determination of the average grain size of metals
GB/T 8170, Rules of rounding off for numerical values and expression and judgement of limiting values
GB/T 8363, Steel — Drop-weight tear test method
GB/T 8650-2015, Evaluation of resistance of pipeline steel and pressure vessel steel to hydrogen-induced cracking
GB/T 10561-2023, Steel — Determination of content of non-metallic inclusions — Micrographic method using standard diagrams
GB/T 14977, General requirements for surface quality of hot-rolled steel plates
GB/T 17505, Steel and steel products — General technical delivery requirements
GB/T 20066, Steel and iron — Sampling and preparation of samples for the determination of chemical composition
GB/T 20123, Steel and iron — Determination of total carbon and sulfur content — Infrared absorption method after combustion in an induction furnace (routine method)
GB/T 20125, Low-alloy steel — Determination of multi-element contents — Inductively coupled plasma atomic emission spectrometric method
GB/T 21143, Metallic materials — Unified method of test for quasi-static fracture toughness
GB/T 34474, Method for evaluation of banded structure in steel
GB/T 42662, Non-destructive testing of steel tubes — Automated ultrasonic testing for delamination of steel strip/plate for welded steel tubes
3 Terms and definitions
No terms and definitions are required to be defined in this document.
4 Classification, designation method and codes
4.1 Classification
4.1.1 By quality level:
a) Quality Level 1 (PSL1);
b) Quality Level 2 (PSL2).
4.1.2 By transmission medium after pipe making:
a) Plates for natural gas transmission pipelines;
b) Plates for oil transmission pipelines.
4.1.3 By product application:
a) Conventional plates;
b) Steel plates for sour service;
c) Steel plates for submarine pipelines;
d) Steel plates for pipe fittings;
e) Steel plates for high deformability;
f) Steel plates for induction-heated bends;
g) Steel plates for station service.
4.1.4 By delivery condition:
a) Hot-rolled (R);
b) Normalized or normalized-rolled (N);
c) Thermomechanically rolled (M);
d) Quenched + tempered (Q).
4.1.5 By edge condition:
a) Cut edge (EC);
b) Mill edge (EM).
4.2 Designation method
4.2.1 The designation of conventional steel consists of the initial capital letter "L" representing "Line" for pipeline, the specified minimum total proof strength, and the letter code for delivery condition (applicable only to PSL2 quality level).
Example: L415M.
L — Initial capital letter representing "Line" for pipeline;
415 — Specified minimum total proof strength, in MPa;
M — Delivery condition of thermomechanically rolled.
4.2.2 In addition to the nomenclature in 4.2.1, conventional steel designations may also consist of "X" representing pipeline steel, the specified minimum total proof strength, and the letter code for delivery condition (applicable only to PSL2 quality level).
Example: X60M.
X — Pipeline steel;
60 — Specified minimum total proof strength, in ksi;
M — Delivery condition of thermomechanically rolled.
Note 1: The designations of steel grades A and B do not include the specified minimum total proof strength.
Note 2: 1 ksi ≈ 6.895 MPa.
4.2.3 For steel plates for sour service, the initial capital letter "S" for "Sour" is added after the designation specified in 4.2.1 and 4.2.2, e.g., L415MS/X60MS. Specific designations are given in Annex A.
4.2.4 For steel plates for submarine pipelines, the initial capital letter "O" for "Offshore" is added after the designation specified in 4.2.1 and 4.2.2, e.g., L415MO/X60MO. Specific designations are given in Annex B.
4.2.5 For steel plates for pipe fittings, the initial capital letters "PF" for "Pipe Fittings" are added after the designation (without delivery condition code) specified in 4.2.1 and 4.2.2, e.g., L415PF/X60PF. Specific designations are given in Annex C.
Standard
GB/T 21237-2026 Wide and heavy plate for line pipe of petroleum and natural gas (English)
Standard No.
GB/T 21237-2026
Status
to be valid
Language
English
File Format
PDF
Word Count
20500 words
Translation Price(USD)
615.0
Implemented on
2026-12-1
Delivery
via email in 1~8 business day
Detail of GB/T 21237-2026
Standard No.
GB/T 21237-2026
English Name
Wide and heavy plate for line pipe of petroleum and natural gas
GB/T 21237-2026 Wide and heavy plate for line pipe of petroleum and natural gas English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS
CCS
National Standard of the People's Republic of China
GB/T 21237-2026
Wide and heavy plate for line pipe of petroleum and natural gas
石油天然气输送管用宽厚钢板
Issue date: 2026-02-27 Implementation date: 2027-03-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Classification, designation method and codes
5 Ordering information
6 Manufacturing process
7 Technical requirements
8 Test methods
9 Inspection rules
10 Packaging, marking and quality certificate
Annex A (normative) Steel plates for sour service
Annex B (normative) Steel plates for submarine pipelines
Annex C (normative) Steel plates for pipe fittings
Annex D (normative) Steel plates for high deformability
Annex E (normative) Steel plates for induction-heated bends
Annex F (normative) Steel plates for station pipe
Annex G (normative) Method for evaluation of banded structure in acicular ferrite pipeline steel
Wide and heavy plates for oil and gas transmission pipelines
1 Scope
This document specifies the classification, designation method and codes, ordering information, manufacturing process, technical requirements, test methods, inspection rules, packaging, marking and quality certificate for wide and heavy plates for oil and gas transmission pipelines.
This document is applicable to hot-rolled wide and heavy plates (hereinafter referred to as "plates") with a thickness of 6 mm to 90 mm, mainly used for the manufacture of oil and gas transmission steel pipes (including induction-heated bends) and pipe fittings in conventional environments and special environments such as sour service, submarine and station service.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 223 (all parts), Methods for chemical analysis of iron, steel and alloy
GB/T 228.1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
GB/T 229, Metallic materials — Charpy pendulum impact test method
GB/T 232, Metallic materials — Bend test method
GB/T 247, General requirements for packaging, marking and quality certificate of steel plates and strips
GB/T 709-2019, Hot-rolled steel plates and strips — Dimensions, shapes, masses and tolerances
GB/T 2970, Method of ultrasonic testing for thick steel plates
GB/T 2975, Steel and steel products — Location and preparation of samples and test pieces for mechanical testing
GB/T 4157-2017, Laboratory testing of metals for resistance to sulfide stress cracking and stress corrosion cracking in H₂S environments
GB/T 4160, Test method for strain ageing sensitivity of steel (Charpy impact method)
GB/T 4336, Carbon steel and low-alloy steel — Determination of multi-element contents — Spark discharge atomic emission spectrometric method (routine method)
GB/T 4340.1, Metallic materials — Vickers hardness test — Part 1: Test method
GB/T 6394, Determination of the average grain size of metals
GB/T 8170, Rules of rounding off for numerical values and expression and judgement of limiting values
GB/T 8363, Steel — Drop-weight tear test method
GB/T 8650-2015, Evaluation of resistance of pipeline steel and pressure vessel steel to hydrogen-induced cracking
GB/T 10561-2023, Steel — Determination of content of non-metallic inclusions — Micrographic method using standard diagrams
GB/T 14977, General requirements for surface quality of hot-rolled steel plates
GB/T 17505, Steel and steel products — General technical delivery requirements
GB/T 20066, Steel and iron — Sampling and preparation of samples for the determination of chemical composition
GB/T 20123, Steel and iron — Determination of total carbon and sulfur content — Infrared absorption method after combustion in an induction furnace (routine method)
GB/T 20125, Low-alloy steel — Determination of multi-element contents — Inductively coupled plasma atomic emission spectrometric method
GB/T 21143, Metallic materials — Unified method of test for quasi-static fracture toughness
GB/T 34474, Method for evaluation of banded structure in steel
GB/T 42662, Non-destructive testing of steel tubes — Automated ultrasonic testing for delamination of steel strip/plate for welded steel tubes
3 Terms and definitions
No terms and definitions are required to be defined in this document.
4 Classification, designation method and codes
4.1 Classification
4.1.1 By quality level:
a) Quality Level 1 (PSL1);
b) Quality Level 2 (PSL2).
4.1.2 By transmission medium after pipe making:
a) Plates for natural gas transmission pipelines;
b) Plates for oil transmission pipelines.
4.1.3 By product application:
a) Conventional plates;
b) Steel plates for sour service;
c) Steel plates for submarine pipelines;
d) Steel plates for pipe fittings;
e) Steel plates for high deformability;
f) Steel plates for induction-heated bends;
g) Steel plates for station service.
4.1.4 By delivery condition:
a) Hot-rolled (R);
b) Normalized or normalized-rolled (N);
c) Thermomechanically rolled (M);
d) Quenched + tempered (Q).
4.1.5 By edge condition:
a) Cut edge (EC);
b) Mill edge (EM).
4.2 Designation method
4.2.1 The designation of conventional steel consists of the initial capital letter "L" representing "Line" for pipeline, the specified minimum total proof strength, and the letter code for delivery condition (applicable only to PSL2 quality level).
Example: L415M.
L — Initial capital letter representing "Line" for pipeline;
415 — Specified minimum total proof strength, in MPa;
M — Delivery condition of thermomechanically rolled.
4.2.2 In addition to the nomenclature in 4.2.1, conventional steel designations may also consist of "X" representing pipeline steel, the specified minimum total proof strength, and the letter code for delivery condition (applicable only to PSL2 quality level).
Example: X60M.
X — Pipeline steel;
60 — Specified minimum total proof strength, in ksi;
M — Delivery condition of thermomechanically rolled.
Note 1: The designations of steel grades A and B do not include the specified minimum total proof strength.
Note 2: 1 ksi ≈ 6.895 MPa.
4.2.3 For steel plates for sour service, the initial capital letter "S" for "Sour" is added after the designation specified in 4.2.1 and 4.2.2, e.g., L415MS/X60MS. Specific designations are given in Annex A.
4.2.4 For steel plates for submarine pipelines, the initial capital letter "O" for "Offshore" is added after the designation specified in 4.2.1 and 4.2.2, e.g., L415MO/X60MO. Specific designations are given in Annex B.
4.2.5 For steel plates for pipe fittings, the initial capital letters "PF" for "Pipe Fittings" are added after the designation (without delivery condition code) specified in 4.2.1 and 4.2.2, e.g., L415PF/X60PF. Specific designations are given in Annex C.
