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Grade 070M55
Corresponding Standard BS 970-3-1991
Specification for wrought steel for machanical and allied engineering purposes part 3:bright bars for general engineering purposes
Classification Carbon Steel
070M55 Chemical Element Composition Content (%)
Component C Si Mn P S Cr * Ni * Mo *
Minimum Value 0.5 0.1 0.5 - - - - -
Maximum Value 0.6 0.4 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
condition Mark
Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Hardness
HBW 		Impact Energy Absorption
KV2
J
6≤d≤63 Normalizing + Turning or Grinding ≥700 ≥355 ≥12 201~255 -
63＜d≤250 Normalizing + Turning or Grinding ≥600 ≥310 ≥13 170~223 -
6≤d≤13 Hot Rolling + Cold Drawing or Hot Rolling + Cold Drawing + Grinding ≥760 ≥610 ≥6 -
13＜d≤16 Hot Rolling + Cold Drawing or Hot Rolling + Cold Drawing + Grinding ≥750 ≥600 ≥7 -
16＜d≤40 Hot Rolling + Cold Drawing or Hot Rolling + Cold Drawing + Grinding ≥710 ≥575 ≥7 -
40＜d≤63 Hot Rolling + Cold Drawing or Hot Rolling + Cold Drawing + Grinding ≥700 ≥545 ≥8 -
63＜d≤76 Hot Rolling + Cold Drawing or Hot Rolling + Cold Drawing + Grinding ≥670 ≥530 ≥9 -
13＜d≤100 070M55R Quenching + Turning or Grinding 700~850 ≥415 ≥14 201~255 -
6≤d≤63 070M55S Quenching + Turning or Grinding 775~925 ≥480 ≥14 223~277 -
6≤d≤19 070M55T Quenching + Turning or Grinding② 850~1000 ≥570 ≥12 248~302 -
29＜d≤100 070M55R Quenching + Tempering + Cold Drawing or Quenching + Tempering + Cold Drawing + Grinding 700~850 ≥475 ≥10 201~255 -
13＜d≤29 070M55R Quenching + Tempering + Cold Drawing or Quenching + Tempering + Cold Drawing + Grinding 700~850 ≥510 ≥10 201~255 -
6≤d≤63 070M55S Quenching + Tempering + Cold Drawing or Quenching + Tempering + Cold Drawing + Grinding 775~925 ≥525 ≥10 223~277 -
6＜d≤19 070M55T Quenching and tempering + cold drawing or quenching and tempering + cold drawing + grinding② 850~1000 ≥595 ≥9 248~302 -
Rod Turning, Grinding or Cold Drawing and Softening - - - ≤201 -
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
GB ISC CNS JIS KS ASTM/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST SS BS EN/BS
55 U20552 S55C S55C SM55C 1055 G10550 C55E4 C55E
Ck55 		1.1203 C55E
XC55 		55 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

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