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Units
Metric
CGS (Consistent)
FPS (Consistent)
IPS (Consistent)
SI (Consistent)
UK Imperial
US Customary
070M20, PD 970, Bar
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Chemical Composition
Base Element
Fe (Iron)
C (Carbon)
0.16 to 0.24
%
Cr (Chromium)
0.4
% (maximum)
Cu (Copper)
0.4
% (maximum)
Fe (Iron)
97.5 to 99.3
%
(estimate)
Mn (Manganese)
0.5 to 0.9
%
Mo (Molybdenum)
0.1
% (maximum)
Ni (Nickel)
0.4
% (maximum)
P (Phosphorus)
0.035
% (maximum)
S (Sulfur)
0.035
% (maximum)
Balance
Fe (Iron)
Composition Note
1) The steel shall be supplied in the killed condition.
2) Cu + 10 × Sn ≤ 0.60 %.
3) Fe is listed as a Base element for this material, but its % value is not listed in the specification. The value shown is a calculated one.
Mechanical Properties
Tabular Data
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Dimensions
Yield Strength (MPa)
Ultimate Tensile Strength (MPa)
Elongation (% strain)
Diameter and width, ≥ 6 mm to ≤ 13 mm
≥ 440
≥ 560
≥ 10
Diameter and width, > 13 mm to ≤ 16 mm
≥ 420
≥ 530
≥ 12
Diameter and width, > 16 mm to ≤ 40 mm
≥ 370
≥ 490
≥ 12
Diameter and width, > 40 mm to ≤ 63 mm
≥ 355
≥ 480
≥ 13
Diameter and width, > 63 mm to ≤ 76 mm
≥ 325
≥ 450
≥ 14
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Yield Strength
325
MPa (minimum)
Ultimate Tensile Strength
450
MPa (minimum)
Elongation
14
% strain (minimum)
Condition
"Hot rolled + cold drawn" or "hot rolled + cold drawn + ground"
Notes on Mechanical Properties
1) Product size (diameter/width across flats): > 63 mm to ≤ 76 mm.
2) 0.2 % proof strength ≥ 280 MPa. This value only applies when no yield phenomenon occurs.
Other Information
Material Class
Ferrous Alloy
Alloy Family
Carbon Steel
Alloy Group
Low-carbon steel and HSLA steel
Alloy Sub-Group
1020
Country
United Kingdom
Standards Body
BSI (United Kingdom)
Description
Wrought steel for mechanical and allied engineering purposes
Designation
070M20
Specification Type
Standard
Specification
PD 970
Specification Year
2005
Specification Status
Active
Specification Status Notes
Reapproved in 2011
Similar US Grade
1021
Similar UNS Number
G10210
Organization
British Standards Institution (BSI)
Available forms
Bar
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British Standards Institution (BSI)
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