JIS G3445 STKM12B Introduce
JIS G3445 is a standard carbon steel grade that is used in machinery and applications. It covers the dimensions, chemical composition, mechanical properties and requirements of the steel. The dimensions include the outer dimensions, wall thickness, inner dimensions, length and mass. The chemical composition includes the desired amount of carbon and the allowable levels of impurities such as sulfur and phosphorus. The mechanical properties include the strength, elongation, hardness and impact resistance of the steel.
Smelting temperature:1429°C - 1182°C
Application:Carbon steel pipe for mechanical structure
JIS G3445 STKM12B Material Mechanical Properties
JIS G3445 STKM12B steel is a versatile carbon steel alloy with a variety of useful mechanical properties. It exhibits excellent yield strength, tensile strength, and elongation when heat treated properly. Its strength and durability make it a suitable option for many automotive and mechanical engineering applications.
The mechanical properties of the JIS G3445 STKM12B steel are as follows:
| YieldRp0.2 | ≤ 861 (MPa) |
| TeileRm | ≤ 522 (MPa) |
| ImpactKV/Ku | 32(J) |
| ElongationA | 31% |
| Reduction in cross section on fractureZ | 23% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 134 |
JIS G3445 STKM12B Material Thermal Properties
The thermal performance parameters of the JIS G3445 STKM12B steel are as follows:
| Temperature (°C) | 22 | 422 | 563 |
| Modulus of elasticity (GPa) | - | 361 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 44 |
| Thermal conductivity (W/m·°C) | - | 12.3 | 43.2 |
| Specific thermal capacity (J/kg·°C) | - | 342 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.41 | - | - |
| Deity (kg/dm³) | - | - | 133 |
| Poisson’s coefficient, ν | - | - | 242 |
JIS G3445 STKM12B Material Machining Technology
JIS G3445 is a standard of Japanese Industrial Standard that governs the mechanical properties and manufacturing processes of steel tubing. It is a commonly used specification for various applications as it has good strength and ductility. The steel is machined in a number of different operations depending on the end use.