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Pipeline steel

Attention:     Issuing time:2019-12-10 14:47

Pipeline steel
What is "pipeline steel"?
Pipeline steel is a kind of steel used to manufacture oil and gas pipeline transportation system. As a long-distance transportation tool of oil and natural gas, pipeline system has the advantages of economy, safety and uninterrupted.

Pipeline steel application

The product form of pipeline steel includes seamless steel pipe and welded steel pipe, which can be divided into three categories: high cold, high sulfur area and submarine laying. These pipelines with bad working environment have long lines and are not easy to maintain, so they have strict quality requirements.
Many challenges faced by pipeline steel include: most of the oil and gas fields are in polar, ice, desert and marine areas, and the natural conditions are relatively poor; or in order to improve the transportation efficiency, the diameter of the pipeline is constantly expanded, the transmission pressure is constantly increased; the flow of oil in the pipeline is corroded, etc.

Properties of pipeline steel
According to the development trend, laying conditions, main failure forms and failure reasons of oil and gas pipelines, pipeline steel should have good mechanical properties (thick wall, high strength, high toughness, wear resistance), large diameter, weldability, cold and low temperature resistance, corrosion resistance (CO2), seawater resistance, HIC, SSCC performance, etc.

High strength
Pipeline steel requires not only high tensile strength and yield strength, but also yield strength ratio in the range of 0.85 ~ 0.93.

② high impact toughness
High impact toughness can meet the requirements of crack prevention.

③ low ductile brittle transition temperature
The pipeline steel is required to have sufficiently low ductile brittle transition temperature under severe regional and climatic conditions. The shear area of DWTT (drop weight tear test) has become the main control index to prevent pipeline brittle failure. The general specification requires that the fracture shear area of the sample at the minimum operating temperature shall be ≥ 85%.

④ excellent HIC and SSCC resistance

Good welding performance
Good weldability of steel is very important to ensure the integrity and welding quality of pipes.

Standard for pipeline steel
At present, the main technical standards of oil and gas transmission steel pipes used in China are API Spec 5L, dnv-os-f101, ISO 3183, and GB / T 9711. The general situation is as follows:
① API 5L (pipeline specification) is a generally adopted specification formulated by American Petroleum Institute. The specification is only for steel pipe products, excluding the design, selection or installation of pipelines.
② dnv-os-f101 (submarine pipeline system) is a specification specially formulated by DET Norske Veritas for submarine pipelines. It involves a wide range of contents, including pipeline design, materials, manufacturing, installation, testing, operation, maintenance and other aspects. The technical requirements for steel pipes are generally stricter than API 5L.

③ ISO 3183 is the standard on delivery conditions of oil and gas transmission steel pipe formulated by international standardization organization, which does not involve pipeline design, installation, etc. The technical terms are relatively comprehensive and detailed.
④ the latest version of GB / T 9711 is 2017. This version is prepared on the basis of ISO 3183:2012 and API Spec 5L 45th edition. Consistent with the two referenced standards, two product specification levels are specified: PSL1 and PSL2. PSL1 provides pipeline steel pipes with standard quality level; PSL2 adds mandatory requirements including chemical composition, notch toughness, strength performance and supplementary NDT.
API Spec 5L and ISO 3183 are the most influential pipeline specifications in the world. In contrast, most of the world's oil companies are accustomed to using API Spec 5L as the basic specification for the procurement of pipeline steel pipes.

Steel pipe grade and steel grade (GB / T 9711-2017, API 5L)

Standard level Grade of GB / T 9711 Grade of API 5L
PSL1 L175 A25
L175P A25P
L210 A
L245 B
L290 X42
L320 X46
L360 X52
L390 X56
L415 X60
L450 X65
L485 X70
L290R X42R
L245N BN
L290N X42N
L320N X46N
L360N X52N
L390N X56N
L415N X60N
L245Q BQ
L290Q X42Q
L320Q X46Q
L360Q X52Q
L390Q X56Q
L415Q X60Q
L450Q X65Q
L485Q X70Q
L555Q X80Q
L625Q X90Q
L690Q X100M
L245M BM
L290M X42M
L320M X46M
L360M X52M
L390M X56M
L415M X60M
L450M X65M
L485M X70M
L555M X80M
L625M X90M
L690M X100M
L830M X120M
Note: the number after L indicates the minimum yield strength (in MPA);
The number after X also indicates the minimum yield strength in 1000 psi;
Delivery status: r = rolling, n = normalizing (normalizing + tempering), q = quenching + tempering, M = thermomechanical rolling;
The suffix P indicates the phosphorus containing the specified content.
Ordering needs
The ordering contract of pipeline steel shall include these information:
① quantity (total mass or quantity of steel pipe);
② standard level (PSL1 or PSL2);
③ steel pipe type (seamless pipe or welded pipe, specific welding process, pipe end type);
④ according to standards, such as GB / T 9711-2017;
⑤Steel grade;
⑥ outer diameter and wall thickness;
⑦ length and length type (not fixed length or fixed length);
⑧ the appendix shall be adopted.

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