JIS G3454 Pressure Piping Carbon Steel Pipe. Applicable scenarios: Medium and low pressure piping below 350℃ (chemical, petroleum, water supply and drainage, steam transmission, pressure vessel support, municipal pipe networks, etc.), not suitable for high pressure piping. Mainstream materials: STPG370, STPG410, STPG450 (most commonly used in engineering, suitable for different pressure ratings).

Material Introduction: 

STPG370 is a JIS standard... The most common low-pressure carbon steel pipe in the G3454 standard is a low-carbon steel with a carbon content ≤0.25%. It boasts excellent plasticity, toughness, and weldability, as well as good corrosion resistance, making it suitable for low-pressure fluid transportation applications below 300℃, such as general water supply and drainage, low-pressure steam, and civil gas pipelines.

STPG410 is a medium-pressure grade pressure piping steel with higher strength than STPG370. Its carbon content is controlled within a reasonable range, combining strength and processing performance. It exhibits outstanding impact resistance and is suitable for medium-pressure fluid transportation below 350℃, small and medium-sized pressure vessel applications, and low-pressure chemical pipelines.

STPG450 is a medium-high pressure grade pressure piping steel with further improved strength and hardness. It has stable mechanical properties and superior pressure resistance and creep resistance compared to the previous two grades. It is suitable for heavy-duty pressure applications such as medium-high pressure steam transportation below 350℃, petrochemical media transportation, and high-pressure water supply and drainage.

Product Advantages

JIS G3454:2017 is the core standard for pressure piping in Japan, Southeast Asia, and Oceania. Its technology originates from and is optimized from ISO 9329-1 and ISO 9330-1. Project acceptance is straightforward, and it is suitable for markets in Japan, South Korea, Australia, Southeast Asia, and the Middle East. It can be directly used in local pressure piping projects and can replace materials in international standards such as DIN 1629 and ASTM A53, offering strong versatility.

Precisely adapted to pressure scenarios, stable performance. Covering all pressure levels from low to medium-high pressure, STPG370, STPG410, and STPG450 precisely match different pressure requirements. They operate without embrittlement or leakage during long-term service below 350℃, exhibiting excellent creep and impact resistance. The low P and low S design (P≤0.040%, S≤0.040%) ensures pure steel with few internal defects, making it suitable for core scenarios such as fluid transportation and pressure vessels, ensuring high safety. Excellent processing and welding performance, convenient construction. Low-carbon/medium-carbon design with low carbon equivalent, minimizing the risk of cold cracking during welding. Compatible with conventional welding processes such as manual arc welding, TIG welding, and submerged arc welding, requiring no complex preheating treatment. Easy to bend, flare, drill, and bevele, resulting in high on-site installation efficiency. Meets the rapid construction and delivery requirements of export projects. Pipe ends can be customized as needed.

Chemical composition (mass fraction %)

Mechanical properties(At room temperature, wall thickness ≤ 16mm)

Statistics on the popular models and common specifications of carbon steel pipes

Select materials based on application

For general fluid transportation (water, gas, oil): 20#, Q235B, A53 Gr.B, STPG370

The best cost-performance ratio, globally applicable

For high-temperature / steam / boiler pipes: A106 Gr.B, 20G, 15CrMoG, P235TR1/P235GH

Better resistance to high temperature and pressure

For oil and gas pipelines: API 5L Gr.B, X42, X52, X60

High strength and good toughness, suitable for long-distance pipelines

For low-temperature environments (cold storage, LNG support): A333 Gr.1/Gr.3, 16MnDG

Resistant to low temperature without cracking

For structural pipes (supports, machinery, steel structures): Q355B (old 16Mn), St44.2, A36

High strength and good load-bearing capacity