Posco Production Specifications

PRODUCTION SPECIFICATIONS

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A) Chemical Composition

Specifications C Si Mn P S Ni Cr Mo
SK65 0.60~0.70              
SK75 0.70~0.80              
SK85 0.80~0.90              
SK95 0.90~1.00 0.10~0.35 0.10~0.50    
-
-
-
SK105 1.00~1.10              
SK120 1.15~1.25     0.030Max 0.030Max 1.30~2.00
-
-
SKS51 0.75~0.85         0.40~0.70 0.40~0.60 0.15~0.25
SNCM220 0.17~0.23 0.15~0.35 0.60~0.90          
SCM415 0.13~0.18              
SCM430 0.28~0.33 0.15~0.35 0.60~0.90     0.25Max 0.90~1.20 0.15~0.30
SCM435 0.33~0.38              
SCM440 0.38~0.43              
SMn420 0.17~0.23 0.15~0.35 1.20~1.50     0.25Max 0.35Max -
S45C 0.42~0.48 0.15~0.35 0.60~0.90    
-
-
 -
S50C 0.47~0.53 0.15~0.35 0.60~0.90    
-
-
 -
S55C 0.52~0.58        
-
-
 -
SAE1536 0.30~0.38
-
 1.20~1.55 0.030Max 0.030Max
-
-
 -
SAE1541 0.36~0.45
-
 1.30~1.65    
-
-
 -
SAE1080 0.74~0.88 0.15~0.40 0.60~0.90    
-
-
 -
DN-50CrV4 0.47~0.55 0.25~0.50 0.70~1.10    
-
 0.90~1.20 V:0.1~0.2
DN-75Cr1 0.70~0.80 0.25~0.50 0.60~0.80    
-
 0.30~0.40 -
AUTOBEAM 0.30Max
-
 0.50Max 0.30Max 0.005Max
-
 0.10~0.30 B:10~30ppm
  • The specifications listed above are currently produced by POSCO.
  • Please refer to the dimensions available by TS grade for your final selection.
  • Refer the dimensions on the next page when ordering products in specifications not listed above.

B) Carbon Steel Specifications (Compatibility with specifications according to carbon and alloy content):-

Types JIS SAE DN POSCO

 

 

Steel for machine structural use

High-carbon Steel S30C, S35C, S40C,

S45C, S50C, S55C		 1030,1035, 1040, 1045, 1050, 1055 C30, C45, C50, C55 POS20FB

POS45FB
Alloy Steel Ni-Cr-Mo SNCM220 8620, 8622 20NiCrMo2, 20NiCrMoS2
-
Cr SCr415, 420, 430 5046 34Cr4, 34CrS4
-
Cr-Mo SCM415, 420, 430, 435, 440 4120, 4130, 4135, 4140 34CrMo4, 34CrMoS4
-
Mn SMn443 1536, 1541, 1552 34CrMo4, 34CrMoS4
-
B In-house standardized
-
-
AUTOBEAM
Others SUP9
-
 50CrV4
-

 

Tool-steel

 High-carbon Steel S60C, S65C, S70C, S75C, SK65, SK75, SK85, SK95, SK105, SK120 1060, 1065, 1070, 1075, 1080, 1085, 1090, 1095 C80W1
-
Alloy Steel SKS51
-
-
-
-
-
 75Cr1
-
  • *Eight grades, from S10C to S28C, are not included in the "steel for machine structural use" category, while the grades between SAE1060 and SAE1095 are included in the "tool-steel" category.
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