SMnC420 SMnC 21 - JIS G 4106-1979

Grade	SMnC420
Old Grade
Corresponding Standard	JIS G 4106-1979 Manganese Steels and Manganese Chromium Steels for Machine Structural Use
Classification	Alloy Steel

SMnC420 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu
Minimum Value	0.17	0.15	1.2	-	-	0.35	-	-
Maximum Value	0.23	0.35	1.5	0.03	0.03	0.7	0.25	0.3

SMnC420 Mechanical Properties

Heat Treatment or Condition	Tensile Strength σ_b Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW	Impact Energy Absorption KV2 J
Double Quenching and Tempering	≥834	≥13	≥30	235~321	≥49

New and Old Grade Replacement List

Approximate Comparison Table Structural Alloy Steel

China

Japan

South Korea

United States

International Organization for Standardization

Germany

France

European Standard

Russia

ISC

JIS

ASTM/AISI

UNS

ISO

DIN EN/DIN

W-Nr.

NF EN/NF

Numerical Grade

GOST

20CrMn
20CrMnH

A22202

SMnC420

5120

G51200

20MnCr5

1.7147

20MC5

20MnCr5

1.7147

20ХГ

SMnC420 Corresponding Standards(Same grade name, different standards)

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!