20Cr4 1.7027 - DIN 17210-1986

Grade	20Cr4
Germany W-Nr.	1.7027
Corresponding Standard	DIN 17210-1986 Case Hardening Steels – Technical Delivery Conditions
Classification	Alloy Steel
Properties	Carburizing Ability

20Cr4 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr
Minimum Value	0.17	-	0.6	-	-	0.9
Maximum Value	0.23	0.4	0.9	0.035	0.035	1.2

20Cr4 Mechanical Properties

condition	Heat Treatment or Condition	Hardness HBW
All product shapes	Softening Annealing (G)	≤197
Bars, wire, plates, forgings; d≤150	Processed to a Certain Strength (BF)	149~197
Bar stock, plate, forgings; d≤60	Processed to Ferrite-Perlite Structure (BG)	145~192

1 Approximate Comparison Table Structural Alloy Steel

China

Taiwan, China

Japan

South Korea

United States

International Organization for Standardization

Germany

France

European Standard

Russia

United Kingdom

ISC

CNS

JIS

ASTM/AISI

UNS

ISO

DIN EN/DIN

W-Nr.

NF EN/NF

Numerical Grade

GOST

BS EN/BS

20Cr
20CrH

A20202

SCr420

SCr420
SCr420H
SCR420HRCH

SCr420

5120

G51200

20Cr4

1.7027

18C3

20Cr4

1.7027

20Х

527A20

2 Approximate Comparison Table Hardenability Guaranteed Structural Steel

China		Japan	South Korea	United States		International Organization for Standardization	Germany		France	Russia	United Kingdom
GB	ISC	JIS	KS	ASTM	UNS	ISO	DIN EN/DIN	W-Nr.	NF EN/NF	GOST	BS EN/BS
20CrH	A20205	≈SCr420H	≈SCr420H	5120H	H51200	≈20Cr4H	20Cr4	1.7027	(20MC5)	20Х	(527H17)

3 Approximate Comparison Table Hardenability Guaranteed Structural Steel

China		Taiwan, China	Japan	South Korea	United States		International Organization for Standardization	Germany		Russia
GB	ISC	CNS	JIS	KS	ASTM	UNS	ISO	DIN EN/DIN	W-Nr.	GOST
20Cr1H	A20215	SCr420H	SCr420H	SCr420H	≈5120H	≈H51200	20Cr4H	≈20Cr4	≈1.7027	20Х

20Cr4 Corresponding Standards(Same grade name, different standards)

1	DIN 17210-1986
	20Cr4 1.7027
2	ISO 683-18-1996
	20Cr4
3	ISO 683-11-1987
	20Cr4 20Cr4H (4) 20Cr4HH 20Cr4HL
4	ISO 683-17-2014
	20Cr 4
5	ASTM A534-2014
	20Cr4 B21
6	DIN EN ISO 683-3-2019
	20Cr4
7	ISO 683-3-2019
	20Cr4
8	DIN EN ISO 683-17-2015
	20Cr4 1.7027
9	ISO 683-11-2012
	20Cr4
10	ISO 683-18-2014
	20Cr4
11	EN 10277-2018
	20Cr4 1.7027
12	ISO 4954-2018
	20Cr4
13	ISO 4954-1-2024
	20Cr4
14	JIS G 7105-2000
	20Cr4

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