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KS D4101 - Standard for Engineering Structural Cast Steel

This is a Korea standard for the chemical analysis and mechanical properties of engineering structural steel. This material has higher strength, mechanical properties, shock resistance and corrosion resistance. Engineering structural steel is mainly used to manufacture a wide range of engineering structures, such as the bridge, hull, steel rail, high-pressure vessel and construction steel structure, and so on.

The following is the main content of KS D4101 (1995) standard for your reference.

The steel number and chemical analysis of engineering structural steel (mass fraction) (%)

steel number C Si Mn P S Cr Ni Mo
SCC3 0.30-0.40 0.30-0.60 0.50-0.80 0.040 0.040 - - -
SCC5 0.40-0.50 0.30-0.60 0.50-0.80 0.040 0.040 - - -
SCMn1 0.20-0.30 0.30-0.60 1.00-1.60 0.040 0.040 - - -
SCMn2 0.25-0.35 0.30-0.60 1.00-1.60 0.040 0.040 - - -
SCMn3 0.30-0.40 0.30-0.60 1.00-1.60 0.040 0.040 - - -
SCMn5 0.40-0.50 0.30-0.60 1.00-1.60 0.040 0.040 - - -
SCSiMn2 0.25-0.35 0.50-0.80 0.90-1.20 0.040 0.040      
SCMnCr2 0.25-0.35 0.30-0.60 1.20-1.60 0.040 0.040 0.40-0.80 - -
SCMnCr3 0.30-0.40 0.30-0.60 1.20-1.60 0.040 0.040 0.40-0.80 - -
SCMnCr4 0.35-0.45 0.30-0.60 1.20-1.60 0.040 0.040 0.40-0.80 - -
SCMnM3 0.30-0.40 0.30-0.60 1.20-1.60 0.040 0.040 ≤0.20 - 0.15-0.35
SCCrM1 0.20-0.30 0.30-0.60 0.50-0.80 0.040 0.040 0.80-1.20 - 0.15-0.35
SCCrM3 0.30-0.40 0.30-0.60 0.50-0.80 0.040 0.040 0.80-1.20 - 0.15-0.35
SCMnCrM2 0.25-0.35 0.30-0.60 1.20-1.60 0.040 0.040 0.30-0.70 - 0.15-0.35
SCMnCrM3 0.30-0.40 0.30-0.60 1.20-1.60 0.040 0.040 0.30-0.70 - 0.15-0.35
SCNCrM2 0.25-0.35 0.30-0.60 0.90-1.50 0.040 0.040 0.30-0.70 1.60-2.00 0.15-0.35

The mechanical properties of engineering structural steel

steel number Mechanical properties (no less than) hardness
HBS
σb /MPa σs/ Mpa δ(%) ψ (%)
SCC3A 520 265 13 20 143
SCC3B 620 370 13 20 183
SCC5A 620 295 9 15 163
SCC5B 690 440 9 15 201
SCMn1A 540 275 17 35 143
SCMn1B 590 390 17 35 170
SCMn2A 590 345 16 35 163
SCMn2B 640 440 16 35 183
SCMn3A 640 370 13 30 170
SCMn3B 690 490 13 30 197
SCMn5A 690 390 9 20 183
SCMn5B 740 540 9 20 212
SCSiMn2A 590 295 13 35 163
SCSiMn2B 640 440 17 35 183
SCMnCr2A 590 370 13 30 170
SCMnCr2B 640 440 17 35 180
SCMnCr3A 640 390 9 25 183
SCMnCr3B 690 490 13 30 207
SCMnCr4A 690 410 9 20 201
SCMnCr4B 740 540 13 25 223
SCMnM3A 690 390 13 30 183
SCMnM3B 740 490 13 30 212
SCCrM1A 590 390 13 30 170
SCCrM1B 690 490 13 30 201
SCCrM3A 690 440 9 25 201
SCCrM3B 740 540 9 25 217
SCMnCrM2A 690 440 13 30 201
SCMnCrM2B 740 540 13 30 212
SCMnCrM3A 740 540 9 25 212
SCMnCrM3B 830 635 9 25 223
SCNCrM2A 780 590 9 30 223
SCMnCrM3B 880 685 9 20 269

 

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