Precision Steel Tube factory JIS G3445 stkm11a Precision Steel Automobile Tubes JIS G 3445 Carbon steel tubes for machine structural purposes Application: For machine structural purposes Size Range:OD 5-420mm WT 0.5-50mm Length 12m max Grade: STKM 11A STKM 12 (ABC) STKM 13(ABC) STKM 14(ABC) STKM 15(AC) etc Heat treatment(Please specify the delivery condition and heat treatment requirement when sending the enquiry.) HR hot rolled CW cold worked SR stress relieved A annealed N normalized HF hot formed CHEMICAL COMPOSITION unit:% max Steel GradeCSMnPS STKM 11A0.120.350.600.0400.040 STKM 12A0.200.350.600.0400.040 STKM 12B STKM 12C STKM 13A0.250.350.30-0.900.0400.040 STKM 13B STKM 13C STKM 14A0.300.350.30-1.000.0400.040 STKM 14B STKM 14C STKM 15A0.25-0.350.350.30-1.000.0400.040 STKM 15C STKM 16A0.35-0.450.400.40-1.000.0400.040 STKM 16C STKM 17A0.45-0.550.400.40-1.000.4000.040 STKM 17C STKM 18A0.180.551.500.0400.040 STKM 18B STKM 18C STKM 19A0.250.551.500.0400.040 STKM 19C STKM 20A0.250.551.600.0400.040 Note:1.When the purchaser require product analysis for the tubes made of killed steel, http://www.steeltubeschina.com..../carbon-steel-tube/p