Products Description
JIS G3445 Carbon Steel Seamless Mechanical Tubing
Why does JIS G3445 carbon steel seamless steel pipe have an advantage in the field of machinery?
1. The steel pipe material under the JIS G3445 standard is mainly low-carbon steel, such as the STKM11A/STKM13 series, with a welding carbon equivalent (CE) of <0.35%, which can be welded without preheating, which can significantly reduce the processing cost. Compared with the same grade of carbon steel pipe, the cost is about 25% lower than ASTM A106 (because the high-temperature performance testing cost is saved).
2. STKM12C is the best material choice for hydraulic cylinders. The tolerance of JIS G3445 carbon steel seamless steel pipe is controlled at ±0.15mm through the cold drawing process, while ASTM A53 requires additional grinding under the same processing technology. JIS G3445 has become the cost-effective choice for ≤32MPa hydraulic cylinder bodies with its precision cold drawing process.
3. JIS G3445 carbon steel seamless pipe supports deep processing such as stamping and bending, and can be used for chassis brackets and body frame forming of automobiles.
Applications
JIS G3445 Carbon Steel Seamless Mechanical Tube is suitable for a wide range of applications across a wide range of industries. These applications include:
- Automotive parts: suspension systems, steering columns, drive shafts and other structural components.
- Machinery parts: frames, shafts and gears.
- Construction equipment: crane booms, bridge components and other heavy-duty applications.
- General engineering: structural frames, conveyor systems and other mechanical applications.
Chemical Composition
| Steel Grade | Chemical Composition | |||
| STKM 11A | C: 0.12% max, Si: 0.35% max, Mn: 0.60% max, P: 0.040% max, S: 0.040% max | |||
| STKM 12A | C: 0.20% max, Si: 0.35% max, Mn: 0.60% max, P: 0.040% max, S: 0.040% max | |||
| STKM 12B | C: 0.20% max, Si: 0.35% max, Mn: 0.60% max, P: 0.040% max, S: 0.040% max | |||
| STKM 12C | C: 0.20% max, Si: 0.35% max, Mn: 0.60% max, P: 0.040% max, S: 0.040% max | |||
| STKM 13A | C: 0.25% max, Si: 0.35% max, Mn: 0.30-0.90%, P: 0.040% max, S: 0.040% max | |||
| STKM 13B | C: 0.25% max, Si: 0.35% max, Mn: 0.30-0.90%, P: 0.040% max, S: 0.040% max | |||
| STKM 13C | C: 0.25% max, Si: 0.35% max, Mn: 0.30-0.90%, P: 0.040% max, S: 0.040% max | |||
| STKM 15A | C: 0.25% max, Si: 0.35% max, Mn: 1.30% max, P: 0.040% max, S: 0.040% max | |||
Mechanical Properties
| Steel Grade | Tensile Strength(MPa) | Yield Strength(MPa) | Elongation(%) |
| STKM 11A | 290 min | 180 min | 25 min |
| STKM 12A | 345 min | 175 min | 35 min |
| STKM 12B | 390 min | 275 min | 25 min |
| STKM 12C | 470 min | 355 min | 20 min |
| STKM 13A | 375 min | 215 min | 30 min |
| STKM 13B | 440 min | 305 min | 20 min |
| STKM 13C | 510 min | 375 min | 20 min |
| STKM 15A | 470 min | 345 min | 20 min |
Possible Alternative Grades
While JIS G3445 specifies a comprehensive range of carbon steel seamless mechanical tubing, there are alternative grades available in other international standards. Some potential alternatives to consider are ASTM A519, DIN 2391, and BS 6323.
It is essential to consult the relevant standards and compare the material properties and specifications when considering alternative grades for specific applications.
Packaging
Once the pipes have passed all inspections and tests, they are ready for packaging. They are usually packaged in bales wrapped in plastic. The pipes can be bundled and ready for delivery according to customer requirements, ensuring that the pipes are protected during transportation and prevent surface damage.
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