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DIN 2391

Standard:  DIN 2391-2
Precision seamless steel tubes.
Chemical Composition(%):

Steel Grade Chemical Analysis  %
Grade Material NO. C max. Si max. Mn P max. S max.
St 30 Si 1.0211 0.1 0.3 =0.55 0.025 0.025
St 30 Al 1.0212 0.1 0.05 =0.55 0.025 0.025
St 35 1.0305 0.17 0.35 =0.40 0.025 0.025
St 45 1.0408 0.21 0.35 =0.40 0.025 0.025
St 52 1.058 0.22 0.55 =1.60 0.025 0.025
Can join the alloy elements: Nb:=0.03%;Ti:=0.03%;V:=0.05%;Nb+Ti+V:=0.05%

Mechanical Properties:
          Delivery State BK BKW BKS GBK NSK
Grade
Grade Material NO. Tensile Strength
(N/mm2)
Min.
Elongation
%
Min.
Tensile Strength
(N/mm2)
Min.
Elongation
%
Min.
Tensile Strength
(N/mm2)
Min.

Yield Strength
 (N/mm2)
min.

Elongation
%
Min.
Tensile Strength
(N/mm2)
Min.
Elongation
%
Min.
Tensile Strength
(N/mm2)
Min.
Yield Strength 
 (N/mm2)
min.
Elongation
%
Min.
St 30 Si 1.0211 430 8 380 12 380 280 15 280 30 290-420 215 30
St 30 Al 1.0212 430 8 380 12 380 280 15 280 30 290-420 215 30
St 35 1.0305 480 6 420 10 420 315 14 315 25 340-470 235 25
St 45 1.0408 580 5 520 8 520 375 12 390 21 440-570 255 21
St 52 1.058 640 4 580 7 580 420 10 490 22 490-630 355 22

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