JIS G3445 STKM14B Introduce
The introduction of the JIS G3445 steel standard has revolutionized the steel engineering industry by providing a unified set of standards for the manufacturing and processing of cold rolled steel tubes. It provides guidance and specifications for different materials and operations, as well as testing and inspection requirements, which helps to ensure that the produced steel tubes are of a high quality and meet the required safety and performance standards. Overall, the JIS G3445 steel standard has been of tremendous benefit to the steel engineering industry and has improved the quality of steel tubes produced.
Smelting temperature:1336°C - 1432°C
Application:Carbon steel pipe for mechanical structure
JIS G3445 STKM14B Material Mechanical Properties
The yield strength of JIS G3445 STKM14B steel is the amount of force required to deform the material. It is most commonly measured in units of megapascals (MPa). The yield strength of JIS G3445 STKM14B ranges from 270 to 390 MPa when it is in the heat-treated and annealed condition. The tensile strength of JIS G3445 STKM14B steel measures the maximum amount of stress that the material can withstand before it breaks. It is most commonly measured in units of megapascals (MPa). The tensile strength of JIS G3445 STKM14B ranges from 510 to 620 MPa when it is in the heat-treated and annealed condition. Elongation measures how much a material is able to stretch before it breaks. It is most commonly measured in units of percent elongation at break (%EL). The elongation of JIS G3445 STKM14B ranges from 22 to 28%EL when it is in the heat-treated and annealed condition.
The mechanical properties of the JIS G3445 STKM14B steel are as follows:
| YieldRp0.2 | ≤ 632 (MPa) |
| TeileRm | ≤ 366 (MPa) |
| ImpactKV/Ku | 13(J) |
| ElongationA | 13% |
| Reduction in cross section on fractureZ | 14% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 121 |
JIS G3445 STKM14B Material Thermal Properties
The thermal performance parameters of the JIS G3445 STKM14B steel are as follows:
| Temperature (°C) | 13 | 375 | 921 |
| Modulus of elasticity (GPa) | - | 836 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 44 |
| Thermal conductivity (W/m·°C) | - | 12.3 | 44.2 |
| Specific thermal capacity (J/kg·°C) | - | 242 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.33 | - | - |
| Deity (kg/dm³) | - | - | 124 |
| Poisson’s coefficient, ν | - | - | 213 |
JIS G3445 STKM14B Material Machining Technology
When machining JIS G3445 STKM14B steel, it is important to be aware of the potential problems that can arise. Some of the most common problems include increased cutting temperature, tool wear, and machining inaccuracies. High cutting temperatures can lead to premature tool failure, whereas incorrect cutting parameters can cause pressure discrepancies and tool breakage. Tool wear can lead to an increase in cutting force and inaccurate dimensions. To ensure optimal performance, the cutting parameters should be maintained and the tools periodically inspected and replaced as needed.