DIN 2391-1

DIN 2391-81 Part 2 defines the technical delivery conditions for seamless precision steel tubes according to DIN 2391 Part 1 which are made from the steel grades listed in section 5.

Sunny Steel offers an extensive range of seamless precision steel tubes.

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

Size(mm):

  • O.D.:6.0-224.0
  • W.T.:1-15
  • L:max 12000
Read more:
Features Specifications
OD(mm)　 Wall Thickness Unit(mm)
2 2.5 3 3.5 4 4.5 5 6 6.5-7 7.5-8 8.5-9 9.5-10 11 12
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 　 　 　 　 　 　 ● ● ● ● ● ● ● ●
Grade and Chemical Composition(%)
Grade
 Chemical Composition(%):
C max Si max Mn P max S max
St 35 0.17 0.35 ≥0.40 0.025 0.025
St 45 0.21 0.35 ≥0.40 0.025 0.025
St 52 0.22 0.55 ≤1.60 0.025 0.025

Steel grade Chemical Composition(%):
Steel name Steel number C max Si max Mn P max S max Al min
E215 1.0212 0.10 0.05 0.70 0.025 0.025 0.025
E235 1.0308 0.17 0.35 1.20 0.025 0.025 -
E355 1.0580 0.22 0.55 1.60 0.025 0.025 -
Mechanical Properties(Mpa)

Steel grade 		BK BKW BKS GBK NBK
RmN/mm
min		 min RmN/mm
min		 min N/mm
min		 ReH
N/mm
min		 min N/mm
min		 min N/mm
min		 ReH
N/mm
min		 min
St35 480 6 420 10 420 315 14 315 25 340-470 235 25
St45 580 5 520 8 520 375 12 390 21 440-570 235 21
St52 640 4 580 7 580 420 10 490 22 490-630 355 22

 

Steel grade Minimum values for the delivery condition
Steel name Steel number + C + LC + SR + A + N
Rm Mpa A% Rm Mpa A% Rm Mpa ReH Mpa A% ReH Mpa A% Rm Mpa ReH Mpa A%
E215 1.0212 430 8 380 12 380 280 16 280 30 290-430 215 30
E235 1.0308 480 6 420 10 420 350 16 315 25 340-480 235 25
E355 1.0580 640 4 580 7 580 450 10 450 22 490-630 355 22

JIS Number and Corrensponding Foreign Standards (DIN2391)

 
JIS
ASTM
BS
DIN
NF
ISO

Index Number

Standard Number

Grade

Tupe

Standard Number

Grade

Tupe

Standard Number

Grade

Tupe

Standard Number

Grade

Tupe

Standard Number

Grade

Tupe

Standard Number

Grade

Tupe

G3445
STKM11A
C
A512
MT1010
C
1717
ERWC1
C
2391
St30Si
C
3304
R28
C
C017
A513
MT1010
C
St30A1
C
3305
"
C
2393
St28
C
3306
"
C
RSt28
C
2394
St28
C
USt28
C
RSt28
C
STKM12A
C
A512
MT1015
C
1717
ERWC2
C
2391
St37-2
3304
R33
C
A513
MT1015
C
6323
HFS3
C
RSt37-2
3305
"
"
STKM12B
C
A512
MT1015
C
2394
St37-2
3306
"
"
A513
MT1015
C
Ust38-2
A519
MT1015
C
RSt-2
STKM12C
C
1717
CEWC2
C
A49-322
TU37b
C
"
CFSC3
C
A49-327
TU37b
C
6323
CFS3
C
"
CFS3A
C
STKM13A
C
A312
MT1020
C
1717
ERWC3
C
2391
St45
C
A49-324
TU37b
C
2937
TS4
C
A513
MT1020
C
2393
St44-2
C
A49-330
TU37b
C
3304
R37
"
2394
St44-2
C
A49-343
TU38b
C
3305
"
"
STKM13B
C
A513
MT1020
C
3306
"
"
STKM13C
C
1717
CEWC3
C
"
CFSC4
C
6323
CFS4
C
STKM14A
C
A513
MT1020
C
6323
HFS4
C
2937
TS9
C
3304
R42
"
STKM14B
C
6323
HFS5
C
3305
R42
C
STMK14C
C
3306
"
"
STKM15A
C
A513
1030
C
A519
1030
C
STKM15C
STKM16A
C
A519
1040
C
A49-311
TUXC35
C
A49-312
TUXC35
C
STKM16C
C
STKM17A
C
A519
1050
C
6323
HFS8
C
STKM17C
C
6323
CFS8
C
STKM18A
C
A519
1518
C
1717
ERWC5
C
A49-310
TU52b
C
A49-311
TU52b
C
A49-312
TU52b
C
STKM18B
C
A49-321
TU52b
C
A49-323
TU52b
C
A49-326
TU52b
C
STKM18C
C
A49-330
TU52b
C
A49-341
TS42a
C
"
TS47a
C
A49-343
TS18M5
C
STKM19A
C
A519
1524
C
2391
ST52
C
2937
TS18
C
2393
ST52-3
C
2938
Gr.1
C
2394
ST52-3
C
3304
R50
C
3305
R50
C
3306
R50
C
STKM20A
C


Seamless pipe Specification, standard and identification

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.