070M55 - BS 970-1-1983

Grade	070M55
Corresponding Standard	BS 970-1-1983 British Standard Specification for Wrough steels for mechanical and allied engineering purposes Part 1. General inspection and testing procedures and specific requirements for carbon,carbon manganese,alloy and stainless steels
Classification	Carbon Steel

070M55 Chemical Element Composition Content (%)

Component	C	Mn	P	S	Cr	Ni	Mo
Minimum Value	0.5	0.5	-	0.025	-	-	-
Maximum Value	0.6	0.9	0.05	0.05	0.3	0.4	0.15

• For older grades of stainless steel, see Table 2 of standard BS 970-4-1970

070M55 Mechanical Properties

diameter or across flats d mm	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Hardness HBW
Hot Rolled Steel; d≤63	Normalizing	≥700	≥355	≥12	© 201~255
hot-rolled steel; d ≤ 250	Normalizing	≥600	≥310	≥13	© 170~223
Bright bar; 6 ≤ d ≤ 63	Normalizing + Turning or Grinding	≥700	≥355	≥12	© 201~255
Bright bars; 63＜d≤250	Normalizing + Turning or Grinding	≥600	≥310	≥13	© 170~223
Bright bars; 6≤d≤13	Normalizing + Cold Drawing or Normalizing + Cold Drawing + Grinding	≥760	Re: ≥610 Rp0.2: ≥570	≥6
Bright bar; 13<d≤16	Normalizing + Cold Drawing or Normalizing + Cold Drawing + Grinding	≥750	Re: ≥600 Rp0.2: ≥560	≥7
Bright bar; 16<d≤40	Normalizing + Cold Drawing or Normalizing + Cold Drawing + Grinding	≥710	Re: ≥575 Rp0.2: ≥495	≥7
Bright bar; 40<d≤63	Normalizing + Cold Drawing or Normalizing + Cold Drawing + Grinding	≥700	Re: ≥545 Rp0.2: ≥440	≥8
Bright bar; 63<d≤76	Normalizing + Cold Drawing or Normalizing + Cold Drawing + Grinding	≥670	Re: ≥530 Rp0.2: ≥420	≥9
Bright bar; 13＜d≤100	Quenching and tempering + turning or grinding R	700~850	Re: ≥415 Rp0.2: ≥385	≥14	201~255
Bright bar; 6 ≤ d ≤ 63	Quenching and tempering + turning or grinding S	775~925	Re: ≥480 Rp0.2: ≥450	≥14	223~277
Bright bars; 6≤d≤19	Quenching and Tempering + Turning or Grinding T®	850~1000	Re: ≥570 Rp0.2: ≥555	≥12	248~302
Bright bar; 29<d≤100	Quenching and Tempering + Cold Drawing or Quenching and Tempering + Cold Drawing + Grinding R	700~850	Re: ≥475 Rp0.2: ≥435	≥10	© 201~255
Bright Bar; 13<d≤29	Quenching and Tempering + Cold Drawing or Quenching and Tempering + Cold Drawing + Grinding R	700~850	Re: ≥510 Rp0.2: ≥475	≥10	© 201~255
Bright bar; 6 ≤ d ≤ 63	Quenching and tempering + cold drawing or Quenching and tempering + cold drawing + grinding S	775~925	Re: ≥525 Rp0.2: ≥485	≥10	© 223~277
Bright bars; 6≤d≤19	Quenching and Tempering + Cold Drawing or Quenching and Tempering + Cold Drawing + Grinding T®	850~1000	Re: ≥595 Rp0.2: ≥550	≥9	© 248~302
Bright Bar	Turning, Grinding or Cold Drawing and Softening				≤201

• Re-yield strength；Rp0.2-Stress at 0.2% proof plastic elongation (0.2% proof strength).
• Not specified, σs in the table refers to Re
• ft.lb=1.3558J

1 Approximate Comparison Table High-Quality Carbon Structural Steel

China

Taiwan, China

Japan

South Korea

United States

International Organization for Standardization

Germany

France

Russia

Sweden

United Kingdom

ISC

CNS

JIS

ASTM/AISI

UNS

ISO

DIN EN/DIN

W-Nr.

NF EN/NF

GOST

BS EN/BS

U20552

S55C

SM55C

1055

G10550

C55E4

C55E
Ck55

1.1203

C55E
XC55

1665

C55E
070M55

2 Approximate Comparison Table High-Quality Carbon Structural Steel

China	Japan	United States	International Organization for Standardization	Germany	France	European Standard		Russia	Sweden	United Kingdom
GB	JIS	ASTM	ISO	DIN EN/DIN	NF EN/NF	EN	Numerical Grade	GOST	SS	BS EN/BS
C55	S55C	1055	C55 C55E4	C55	AF70C55 C54	C55	1.0535	50 55	1655	070M55 50 En9

3 Approximate Comparison Table High-Quality Carbon Structural Steel

Japan	United States	International Organization for Standardization	Germany	France	European Standard		Russia	United Kingdom
JIS	ASTM	ISO	DIN EN/DIN	NF EN/NF	EN	Numerical Grade	GOST	BS EN/BS
S55C	1055	C55E4	Ck55	XC54 XC55H1	C55E	1.1203	55	070M55

4 Approximate Comparison Table Carbon Structural Steel and Engineering Steel

United States	Germany		France	European Standard	United Kingdom
ASTM/AISI	DIN EN/DIN	W-Nr.	NF EN/NF	EN	BS EN/BS
1050	CF53	1.1213	XC48 TS	C53	070M55

5 Approximate Comparison Table High-Quality Carbon Structural Steel

China	Japan	United States	International Organization for Standardization	France	Russia	United Kingdom
GB	JIS	ASTM/AISI	ISO	NF EN/NF	GOST	BS EN/BS
55 (GB/T 699-1999)	S55C	1055	C55 C55E4 C55M2 (ISO 630-1:1987)	C55 XC55	55	060A57 070M55

070M55 Corresponding Standards(Same grade name, different standards)

1	BS 970-3-1991
	070M55
2	BS 970-1-1983
	070M55

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