Mechanical tube 标准 Standard: JIS G3445   用途 Application： 适用于机械制造，汽车制造，自行车制造，家具制作以及其他机械的零部件制造。 It is widely used in manufacturing of Machinery, Automobile, bycycle, furniture and some other machined parts. 主要牌号 Steel Tube Grade:   STKM 11A, STKM12(A,BC),STKM13(A,B,C),STKM14(A,B,C)   化学成分 Chemical Composition   钢级 Standard 牌号 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 Mechanical Properties   钢级 Standard 牌号 Grade 机械性能Mechanical Properties 抗拉强度（Mpa) 屈服强度（Mpa) 伸长率（%） Tensile Strength Yield Strength Elongation JIS G3445 STKM11A ≥295 / ≥35 STKM12A ≥345 ≥175 ≥35 STKM12B ≥390 ≥275 ≥35 STKM12C ≥470 ≥355 ≥25 STKM13A ≥375 ≥215 ≥30 STKM13B ≥440 ≥305 ≥20 STKM13C ≥510 ≥380 ≥15 STKM14A ≥410 ≥245 ≥25 STKM14B ≥500 ≥355 ≥15 STKM14C ≥550 ≥410 ≥15  

42CrMo4 precision seamless steel tube for auto parts   chemical composition:   Carbon C  0.38～0.45% Silicon Si  0.17～0.37% Manganese Mn  0.50～0.80% Sulfur S  Allow residual content ≤0.035% Phosphorus P  allowable residual content ≤0.035% Chromium Cr  0.90～1.20% Nickel Ni  allowable residual content ≤0.30% Copper Cu  allowable residual content ≤0.30% Mo  0.15～0.25%     Mechanical properties: Hardness: Annealing, 255～207HB, indentation diameter 3.8～4.2mm; Quenching, ≥60HRC cr12mov The hardenability, hardness, strength and toughness after quenching and tempering are higher than CR12, and the work with a diameter of 300-400mm or less can be completed Hardenable, small quenching deformation, but poor high temperature plasticity. cr12mov plates are mostly used to manufacture composite molds and tools with large cross-sections, complex shapes and heavy workloads.  

Mechanical tube Standard: JIS G3445 Application: It is widely used in manufacturing of Machinery, Automobile, bycycle, furniture and some other machined parts. Steel Tube Grade: STKM 11A, STKM12(A,BC),STKM13(A,B,C),STKM14(A,B,C) Chemical Composition

GB/T8162/8163 HOT ROLLED SEAMLESS STEEL PIPE