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, the tolerances for the values given above shall be as specified in the Table 2 in JIS G 0321 for seamless steel tubes and in Table 1 for electric resistance welded or butt welded steel tubes
2.For the tubes of STKM 15 made by electric resistance welding process, the lower limit of carbon content may be
Altered by agreement between the parties concerned.
3.For the tubes of STKM 20,Nb in combination with V may be added, in the case, the maximum content of Nb+V shall be 0.15%
Mechanical Properties
Steel GradeTensile strength
Mpa minYield strength
Mpa minElogation%
min
STKM 11A290-35
STKM 12A34017535
STKM 12B39027525
STKM 12C47035520
STKM 13A37021530
STKM 13B44030520
STKM 13C51038015
STKM 14A41024525
STKM 14B50035515
STKM 14C55041015
STKM 15A47027522
STKM 15C58043012
STKM 16A51032520
STKM 16C62046012
STKM 17A55034520
STKM 17C65048010
STKM 18A44027525
STKM 18B49031523
STKM 18C51038015
STKM 19A49031523
STKM 19C55041015
STKM 20A54039023
The tolerances on outside diameter and wall thickness for the tubes shall be as given in Table 4 and Table 5,respectively.Precision Steel Tube factory
website:http://www.steeltubeschina.com/carbon-steel-tube/precision-steel-tube/