50CrMo4 50CrMo4H 50CrMo4HH - ISO 683-1-1987

Grade	50CrMo4
Other Names
Corresponding Standard	ISO 683-1-1987 Heat-Treatable Steels,alloy Steels and Free-Cutting Steels. Part 1:Direct-Hardening Unalloyed and Low-Alloyed Wrought Steel in Form of Different Black Produts
Classification	Alloy Steel

50CrMo4 Chemical Element Composition Content (%)

Component	C	Si ^①	Mn	P	S	Cr	Mo
Minimum Value	0.46	0.1	0.5	-	-	0.9	0.15
Maximum Value	0.54	0.4	0.8	0.035	0.035	1.2	0.3

• The designations are in accordance with the system proposed by ISO/TC 17/SC 2.
• Elements not quoted should not be intentionally added to the steel without the agreement of the purchaser, other than for the purpose of finishing the heat. All reasonable precautions should be taken to prevent the addition, from scrap or other material used in manufacture, of such elements which affect the hardenability, mechanical properties and applicability.
• In the case of the grades with specified hardenability requirements (see tables 5 to 7), except for phosphorous and sulfur, insignificant deviations from the limits for cast analysis are permissible; these deviations shall, however, not exceed in the case of carbon ± 0,01 % (m/m) and in all other cases the values according to table 4.
• For boron-treated steels, see ISO 4954.
• Steels with improved machinability by either lead additions or higher sulfur levels up to about 0,100 % (m/m) S (including controlled sulfide morphology) may be available on request.

50CrMo4 Mechanical Properties

thickness d mm	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Impact Energy Absorption KV2 J
d≤16	Qenching + tempering	1100~1300	≥900	≥9	KU ≥15
16＜d≤4	Qenching + tempering	1000~1200	≥780	≥10	KU ≥20
40＜d≤100	Qenching + tempering	900~1100	≥700	≥12	KU ≥20
100＜d≤160	Qenching + tempering	850~1000	≥650	≥13	KU ≥15
160＜d≤250	Qenching + tempering	800~950	≥550	≥13	KU ≥15

1 Approximate Comparison Table Alloy Steel for Quenching and Tempering

International Organization for Standardization	European Standard
ISO	EN	Numerical Grade
50CrMo4	50CrMo4	1.7228

2 Approximate Comparison Table Structural Alloy Steel

China	Japan	United States	International Organization for Standardization	Germany		European Standard		United Kingdom
GB	JIS	ASTM	ISO	W-Nr.	L-Nr.	EN	Numerical Grade	BS EN/BS
50CrMo	SCM445	4150	50CrMo4	50CrMo4	1.7228	50CrMo4	1.7228	708M40 708M50

50CrMo4 Corresponding Standards(Same grade name, different standards)

1	ISO 683-18-1996
	50CrMo4
2	DIN 17200-1987
	50CrMo4 1.7228
3	EN 10083-3-2006
	50CrMo4 1.7228
4	ISO 683-1-1987
	50CrMo4 50CrMo4H 50CrMo4HH 50CrMo4HL
5	EN 10250-3-1999
	50CrMo4 1.7228
6	DIN 17230-1980
	(50CrMo4) 48CrMo4 1.3565 (1.7238) (1.7228) (49CrMo4)
7	ISO 683-2-2016
	50CrMo4
8	ISO 683-18-2014
	50CrMo4
9	EN ISO 683-2-2018
	50CrMo4
10	EN 10132-2021
	50CrMo4 1.7228
11	NF EN 10083-3-2006
	50CrMo4 1.7228
12	JIS G 7105-2000
	50CrMo4

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