DIN 2391-1 cold Drawn or cold rolled steel tube

DIN 2391 Standard Specification

DIN 2391 standard specifies the Seamless steel tubes used for mechanical and automobile.

The main products of steel / steel grade: DIN2391-1(ST35, ST45, ST52).

Application:

  • for Atuo usd;
  • for machinery use;
  • Oil cylinder tube;
  • Motorcycle shock reducer steel tubes;
  • Auto shock reducer inner cylinder

Steel pipe features specifications

O.D.(mm) Wall Thickness Unit(mm)
22.533.544.5566.5-77.5-88.5-99.5-101112
Φ25-Φ28
Φ32
Φ34-Φ36
Φ38
Φ40
Φ42
Φ45
Φ48-Φ60
Φ63.5
Φ68-Φ73
Φ76
Φ80
Φ83
Φ89
Φ95
Φ102
Φ108
Φ114
Φ121
Φ127
Φ133
Φ140
Φ146
Φ152
Φ159
Φ168

DIN 2391 seamless precision steel tubes mechanical properties(Mpa)

Steel GradeMinimum values for the delivery condition
Steel NameSteel NumberBKBKWBKSGBKNBK
RmA %RmA %RmReHA %RmA %RmReHA %
MpaMpaMpaMpaMpaMpaMpa
St 30 Si1.02114308380123802801628030290 to 42021530
St 30 Al1.02124308380123802801628030290 to 42021530
St 351.03084806420104203151431525340 to 47023525
St 451.0408580552085203751239021440 to 57025521
St 521.058640458075804201049022490 to 63035522
DIN 2391 seamless precision tubes applications – Used in Hydraulic & pneumatic cylinder, Mechanical and Automotive engineering.

DIN 2391 seamless precision steel tubes chemical composition(%)

GradeChemical element (%)
SymbolMaterial No.CSiMnPS
St 30 Si1.0211≤0.10≤0.10≤0.55≤0.025≤0.025
St 30 Al1.0212≤0.10≤0.05≤0.55≤0.025≤0.025
St 351.0308≤0.17≤0.35≥0.40≤0.025≤0.025
St 51.0408≤0.21≤0.35≥0.40≤0.025≤0.025
St 521.058≤0.22≤0.55≤1.60≤0.025≤0.025

Inspection and test list for the DIN 2391 Standard

Inspection or test typesTest frequency 
Internal testAcceptance test
Chemical analysisMM
Tensile testingMOne per tested batch
Flattening test or extension testMTwo per tested batch
Dimension verificationMM
Visual inspectionMM
NDT in order to identify leaksIndividualIndividual

JIS Number and Corrensponding Foreign Standards

JIS  ASTM  BS  DIN  NF  ISO  Index Number
Standard NumberGradeTupeStandard NumberGradeTupeStandard NumberGradeTupeStandard NumberGradeTupeStandard NumberGradeTupeStandard NumberGradeTupe
G3445STKM11ACA512MT1010C1717ERWC1C2391St30SiC3304R28CC017
A513MT1010CSt30A1C3305"C
2393St28C3306"C
RSt28C
2394St28C
USt28C
RSt28C
STKM12ACA512MT1015C1717ERWC2C2391St37-23304R33C
A513MT1015C6323HFS3CRSt37-23305""
STKM12BCA512MT1015C2394St37-23306""
A513MT1015CUst38-2
A519MT1015CRSt-2
STKM12CC1717CEWC2CA49-322TU37bC
"CFSC3CA49-327TU37bC
6323CFS3C
"CFS3AC
STKM13ACA312MT1020C1717ERWC3C2391St45CA49-324TU37bC2937TS4C
A513MT1020C2393St44-2CA49-330TU37bC3304R37"
2394St44-2CA49-343TU38bC3305""
STKM13BCA513MT1020C3306""
STKM13CC1717CEWC3C
"CFSC4C
6323CFS4C
STKM14ACA513MT1020C6323HFS4C2937TS9C
3304R42"
STKM14BC6323HFS5C3305R42C
STMK14CC3306""
STKM15ACA5131030C
A5191030C
STKM15C
STKM16ACA5191040CA49-311TUXC35C
A49-312TUXC35C
STKM16CC
STKM17ACA5191050C6323HFS8C
STKM17CC6323CFS8C
STKM18ACA5191518C1717ERWC5CA49-310TU52bC
A49-311TU52bC
A49-312TU52bC
STKM18BCA49-321TU52bC
A49-323TU52bC
A49-326TU52bC
STKM18CCA49-330TU52bC
A49-341TS42aC
"TS47aC
A49-343TS18M5C
STKM19ACA5191524C2391ST52C2937TS18C
2393ST52-3C2938Gr.1C
2394ST52-3C3304R50C
3305R50C
3306R50C
STKM20AC
G3441SCr420TKCrC018
SCM415TKCrMo
SCM418TKCrMo6323CFS10CrMo
SCM420TKCrMoA5195120CrMo
SCM430TKCrMoA5194130CrMo
SCM435TKCrMoA5194135CrMo
SCM440TKCrMoA5194140CrMo6323CFS10CrMo
The values stated in inch-pound units are to be regarded as the standard.