The differences in performance between LSAW Steel Pipes of different standards are mainly reflected in the following aspects:

mechanical property

GB/T 9711： This standard has strict regulations on the mechanical properties of steel pipes, divided into two quality levels: PSL1 and PSL2, with PSL2 having higher requirements. The yield strength, tensile strength, elongation and other indicators of different steel grades of steel pipes are specified, such as the yield strength requirement of L245 steel grade ≥ 241MPa and tensile strength ≥ 414MPa; And there are also requirements for impact toughness to ensure the impact resistance of steel pipes in different environments.

API SPEC 5L： There are also two levels, PSL1 and PSL2, similar to GB/T 9711, with stricter mechanical performance requirements for PSL2 level. For common steel grades, such as X60 steel grade, the yield strength requirement is ≥ 414MPa and the tensile strength requirement is ≥ 517MPa. The data is similar to similar steel grades under GB/T 9711 standard, but there may be slight differences in specific values and test methods.

SY/T 5037： Mainly for the transportation of ordinary fluids, compared to the first two standards, it has relatively lower requirements for mechanical properties and is suitable for situations where strength requirements are not particularly high. For commonly used Q235 steel pipes, the yield strength is generally ≥ 235MPa and the tensile strength is ≥ 370MPa.

ASTM A53： The minimum yield strength and tensile strength requirements for steel pipes are specified, such as A53 Grade B steel pipes, with a yield strength of ≥ 241MPa and a tensile strength of ≥ 414MPa. However, there is a gap in the comprehensiveness and strictness of overall performance requirements compared to specialized oil and gas transportation standard steel pipes.

Chemical properties

GB/T 9711： The chemical composition of steel pipes has been limited, and different steel grades have different requirements for the content of carbon, manganese, phosphorus, sulfur and other elements to ensure the strength, toughness and corrosion resistance of steel pipes. For L245 steel grade under PSL2 level, the carbon content is ≤ 0.24, manganese content is ≤ 1.2, phosphorus content is ≤ 0.025, and sulfur content is ≤ 0.015.

API SPEC 5L： There are similarities with GB/T 9711 in terms of chemical composition requirements, but the specific range of element content may differ. For example, in the PSL2 level, the control of certain alloy elements is more stringent to meet the usage requirements of different regions and working conditions internationally.

SY/T 5037： The steel pipes involved are mostly made of ordinary carbon steel and low-alloy steel, with relatively relaxed requirements for chemical composition, mainly ensuring the basic performance of steel pipes in ordinary fluid transportation.

ASTM A53： Steel pipes covering various materials, including carbon steel and alloy steel, have different chemical composition requirements depending on the material to meet the needs of different application scenarios. However, they are not as detailed as the first two standards in terms of special requirements for oil and gas transportation.

Process performance

GB/T 9711： Require steel pipes to undergo overall mechanical diameter expansion treatment to reduce internal stress and distribute it evenly, improve dimensional accuracy, and facilitate on-site welding construction; At the same time, the pre welding and precision welding process is adopted to ensure stable welding process and high weld quality.

API SPEC 5L： Widely recognized internationally, the manufacturing process and quality control requirements for steel pipes are strict, similar to GB/T 9711, which also emphasizes diameter expansion treatment and high-quality welding processes to ensure the reliability of steel pipes in long-distance oil and gas transportation.

SY/T 5037： The manufacturing process is relatively simple and mainly meets the basic requirements of ordinary fluid transportation pipelines. The control requirements for weld quality, steel pipe size accuracy, and other aspects are lower than the first two.

ASTM A53： There are multiple manufacturing processes to choose from, including welding and seamless, but the specific requirements for oil and gas transportation are not as strict as GB/T 9711 and API SPEC 5L standards in terms of process control.

Corrosion resistance performance

GB/T 9711： Considering the diversity of oil and gas transportation environments, some steel pipes may have corrosion resistance requirements. For example, for steel pipes transporting corrosive media such as sulfur-containing oil and gas, corresponding corrosion resistance test methods and indicators will be specified.

API SPEC 5L： Widely used in international projects, there are a series of anti-corrosion requirements and testing methods for different corrosive environments, such as resistance to hydrogen sulfide corrosion, to meet the oil and gas transportation needs of different regions around the world.

SY/T 5037： In general, the anti-corrosion performance requirements for steel pipes used in ordinary fluid transportation are relatively low. However, for situations with special requirements, corresponding anti-corrosion measures and indicators will be proposed according to the specific situation.

ASTM A53： The corrosion resistance of steel pipes varies depending on the material and usage environment. For some special environments, the corrosion resistance requirements need to be determined and met according to specific application scenarios and customer needs.

There are certain differences in the prices of LSAW steel pipes of different standards, but the magnitude of the differences varies due to various factors. Taking the common GB/T 9711, API SPEC 5L, SY/T 5037, and ASTM A53 standards as examples, generally speaking, their price differences are mainly affected by the following aspects:

Production cost differences caused by standard requirements

Material and chemical composition requirements: Different standards have different regulations on the material and chemical composition of steel pipes. Both GB/T 9711 and API SPEC 5L have multiple steel grade options, and some special steel grades have complex production processes, high costs, and expensive prices due to the addition of alloying elements; The steel pipes in SY/T 5037 standard usually have relatively low material requirements and lower prices. For example, LSAW steel pipes containing chromium, molybdenum and other alloy elements used for transporting highly corrosive oil and gas follow stricter standards and are priced higher than ordinary carbon steel pipes.

Manufacturing process and quality control: High standard steel pipes have stricter manufacturing processes and quality control. PSL2 grade steel pipes, such as API SPEC 5L, have high requirements for non-destructive testing, welding processes, and require high testing frequency and accuracy during the production process, which increases production costs; The price of PSL2 grade steel pipes in the GB/T 9711 standard is usually higher than that of PSL1 grade because they have stricter requirements in terms of mechanical properties, process control, and other aspects.

Market supply and demand and application field factors

Market demand: In the field of oil and gas transportation, if there is a high demand for a certain standard of steel pipe and the supply is relatively tight, the price will rise. In the construction of domestic oil and gas long-distance pipelines, there is a strong demand for large-diameter and high-grade LSAW steel pipes that meet the GB/T 9711 standard, and their prices may increase.

Application areas: Different standards of steel pipes have varying degrees of recognition and applicability in specific application areas. Steel pipes according to the API SPEC 5L standard are widely used in international oil and gas projects, with high demand in the international market and prices influenced by supply and demand in the international market; ASTM A53 standard steel pipes have applications in some fields such as general fluid transportation and building structures. The market competition and demand characteristics are different from those of oil and gas specific standard steel pipes, and the prices also differ.

From the market price perspective, taking common medium specification (such as pipe diameter 600-800mm, wall thickness 8-12mm) and ordinary steel grade (such as L245, L360, etc.) LSAW steel pipes as an example, the price of SY/T 5037 standard steel pipes is approximately 3800-4500 yuan/ton calculated by ton; The price of PSL1 grade steel pipes according to GB/T 9711 standard is around 4500-5500 yuan/ton, while PSL2 grade steel pipes may be priced between 5500-7000 yuan/ton; API SPEC 5L standard steel pipe, if it is PSL1 grade, the price is similar to or slightly higher than GB/T 9711 PSL1, and the price of PSL2 grade is usually between 6000-8000 yuan/ton; The price of ASTM A53 standard steel pipes is approximately 4000-5000 yuan/ton.