Vertical Slurry Pump,Gravel And Sand Dredging Pump,Centrifugal Heavy Duty Dredging Pump,Vertical Heavy Duty Slurry Pump Shijiazhuang Zhongjia Slurry Pump Co.,Ltd. , https://www.zhongjiapump.comJIS G3454 Standard Specifications
The JIS G3454 standard outlines the specifications for carbon steel pipes primarily intended for applications where the operating temperature does not exceed 350°C under pressure. For situations requiring higher-pressure systems, it is recommended to refer to the JIS G3455 standard instead. These pipes can be produced as either seamless steel pipes or resistance-welded steel pipes, allowing buyers to specify their quality requirements depending on whether the pipe will undergo hot or cold working processes.
**Chemical Composition:**
| Grade Symbol | Carbon (C) | Silicon (Si) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) |
|--------------|------------|--------------|----------------|----------------|------------|
| STPG 370 | 0.25 max. | 0.35 max. | 0.30 to 0.90 | 0.040 max. | 0.040 max. |
| STPG 410 | 0.30 max. | 0.35 max. | 0.30 to 1.00 | 0.040 max. | 0.040 max. |
**Mechanical Properties:**
| Grade Symbol | Tensile Strength (kgf/mm² {N/mm²}) | Yield Point/Proof Stress (kgf/mm² {N/mm²}) | Elongation (%) - Test Pieces |
|--------------|-------------------------------------|---------------------------------------------|------------------------------|
| | | | No. 11 & No. 12 | No. 5 | No. 4 Longitudinal | No. 4 Transverse |
| STPG 370 | 38 {373} min | 22 {216} min | 30 min | 25 min | 23 min | 28 min |
| STPG 410 | 42 {412} min | 25 {245} min | 25 min | 20 min | 19 min | 24 min |
**Tolerances on Outside Diameter and Wall Thickness:**
| Division | Tolerance on Outside Diameter | Tolerance on Wall Thickness |
|-----------------------------------|--------------------------------------------------|---------------------------------------------|
| Hot-Finished Seamless Steel Pipe | 40 A or under: ±0.5 mm | Under 4 mm: ±0.6 mm |
| | 50 A or over up to 125 A: ±1% | 4 mm or over: +15%, -12.5% |
| | 150 A: ±1.6 mm | |
| | 200 A or over: ±0.8% | |
| | Nominal size 350 A or over: By circumference, ±0.5% |
| Cold-Finished Seamless Steel Pipe | 25 A or under: ±0.3 mm | Under 3 mm: ±0.3 mm |
| | 32 A or over: ±0.8% | 3 mm or over: ±10% |
| | Nominal size 350 A or over: By circumference, ±0.5% |
These specifications ensure that the pipes meet rigorous standards for both chemical composition and mechanical properties, making them suitable for various industrial applications. Proper attention to manufacturing tolerances helps maintain consistency and reliability in performance across different environments.