标准：
JIS G3445
用途：
适用于机械、汽车、自行车、家具、器具及其他机械零件用碳素钢管
主要生产钢管牌号：
STKM11A、STKM12(A,B,C)、STKM13(A,B,C)、STKM14(A,B,C)
化学成分：
钢 级
Standard |
牌 号
Steel Grade |
化 学 成 分 Chemical Composition(%) |
| C |
Si |
Mn |
P |
S |
| JIS G3445 |
STKM11A |
≤0.12 |
≤0.35 |
≤0.60 |
≤0.040 |
≤0.040 |
| STKM12A |
≤0.20 |
≤0.35 |
≤0.60 |
≤0.040 |
≤0.040 |
| STKM12B |
| STKM12C |
| STKM13A |
≤0.25 |
≤0.35 |
0.30-0.90 |
≤0.040 |
≤0.040 |
| STKM13B |
| STKM13C |
| STKM14A |
≤0.30 |
≤0.35 |
0.30-1.00 |
≤0.040 |
≤0.040 |
| STKM14B |
| STKM14C |
机械性能：
标 准
Standard |
牌 号
Steel Grade |
机 械 性 能 Mechanical properties |
| 抗拉强度（Mpa）Tensile Strength |
屈服强度(Mpa)Yield Strength |
伸长率（%）Elongation |
| JIS G3445 |
STKM11A |
≥295 |
\ |
≥35 |
| STKM12A |
≥345 |
≥175 |
≥35 |
| STKM12B |
≥390 |
≥275 |
≥25 |
| STKM12C |
≥470 |
≥355 |
≥20 |
| STKM13A |
≥375 |
≥215 |
≥30 |
| STKM13B |
≥440 |
≥305 |
≥20 |
| STKM13C |
≥510 |
≥380 |
≥15 |
| STKM14A |
≥410 |
≥245 |
≥25 |
| STKM14B |
≥500 |
≥355 |
≥15 |
| STKM14C |
≥550 |
≥410 |
≥15 |
Remarks 备注：
| HR：hot rolled |
CW：cold worked 冷拔 |
SR：stress relieved 去除应力 |
| A：annealed 退火 |
N：normalized 正火 |
HF：热轧 |
