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JIS SNCM 21

Data Table for:Alloy steel:JIS SNCM 21

Steel grade type Alloy steel:
Standard JIS
Production specifications Steel plate,Sheet, Coil,Flat bar,Round bar, Strip steel,wire,All kinds of forgings.
Mchining Turning
Milling
Grinding
Deep hole drilling: length max 9.8 meters.
Range of work

Round bar steel: 1mm to 2000mm

Square-shape steel: 10mm to 1000mm

steel Plate/sheet:0.08mm to 800mm

Width: 10mm to 1500mm

Lenth: We can supply any lenth based on the customer's requirement.

Forging: Shafts with flanks/pipes/tubes/slugs/donuts/cubes/other shapes

Tubings: OD: φ4-410 mm, with wall thickness ranging from 1-35 mm.

Heat treatment Normalizing,Annealing,Tempering,Quenching,Hardening and tempering,Seasoning,Surface hardening,Carburizing

JIS SNCM 21 Chemical composition and Mechanical properties

Element Weight %
C 0.15-0.20
Mn 0.70-0.90
P 0.035 (max)
S 0.04 (max)
Si 0.15-0.30
Cr 0.40-0.60
Ni 0.40-0.70
Mo 0.15-0.25

Mechanical Properties

Properties Conditions
T (°C) Treatment
Density (×1000 kg/m3) 7.7-8.03 25  
Poisson's Ratio 0.27-0.30 25  
Elastic Modulus (GPa) 190-210 25  
Tensile Strength (Mpa) 1158 25 oil quenched, fine grained, tempered at 425°C
Yield Strength (Mpa) 1034
Elongation (%) 15
Reduction in Area (%) 53
Hardness (HB) 335 25 oil quenched, fine grained, tempered at 425°C

Thermal Properties

Properties Conditions
T (°C) Treatment
Thermal Conductivity (W/m-K) 42.7 100  
Specific Heat (J/kg-K) 477 50-100  
Physical Properties
Quantity Value Unit
Thermal expansion 16 - 17 e-6/K
Thermal conductivity 16 - 16 W/m.K
Specific heat 500 - 500 J/kg.K
Melting temperature 1370 - 1400 °C
Service temperature 0 - 500 °C
Density 8000 - 8000 kg/m3
Resistivity 0.7 - 0.7 Ohm.mm2/m

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