BS970 Steel Specifications

BS970 steel suppliers and stockholders delivering to the whole of the UK. West Yorkshire Steel are suppliers of BS970 specifications in round bar, flat bar and steel plate. BS970 steel grades are commonly carbon and alloy steels which can be heat treated to achieve a wide range of tensile strengths and mechanical properties. Some stainless steel specifications are also referenced in BS970. Although still commonly produced to BS970 designations most carbon and alloy grades have officially been superseded by new BS EN steel standards such as BS EN 10083, BS EN 10088 and BS EN 10277.

If you do not find the BS970 specification you require on our web site please contact our sales team who may be able to assist you with your enquiry.

Form of Supply

West Yorkshire Steel are stockholders and suppliers of British Standard 970 steel specifications in round bar, flat bar and cut plate. Diameters in BS970 grades are available as bright drawn and black hot rolled bar. Grades can be supplied to your required lengths as one offs or multiple cut pieces. Diameters can be supplied precision ground to tight tolerances.

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  • Plate
  • Flat
  • Diameter

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Steel Names

In general terms the specification name given to each BS970 grade can provide an indication of the type of steel and in some grades limited detail of the composition.

Most BS970 specifications are made up of six characters with the first 3 digits giving guidance to the steel type and indicate the following,
000-299   Carbon manganese steel grades
200-240   Carbon manganese free cutting steel grades
250-260   Silicon manganese spring steel grades
300-499   Stainless steel and heat resisting steel grades.
500-999   Alloy steel grades

The 4th character of a BS970 grade is a letter which indicates the following,
A   The steel is supplied to composition only
H   The steel is suitable for heat treatment (though this applies to most specifications)
M   Mechanical properties are available with the steel
S   Stainless steel grades

The last two characters of the grade are 2 numbers that commonly refer to the carbon content of the steel.

BS970 steel specifications supplied by West Yorkshire Steel include the following:-

Carbon Steels Alloy Steels
070M20 251A58
080A15 605M36
080M15 708M40
080M40 709M40
080A42 817M40
080M46 826M40
080M50 655M13
070M55 722M24
535A99 905M39
735A50
835M30

BS970 carbon steel and alloy steel specifications can be heat treated to achieve a wide range of mechanical properties. Alloy steel grades are often supplied in the hardened and tempered condition. When heat treating BS970 grades the limited ruling section must be taken in to consideration. The limited ruling section relates to a specific set of mechanical properties achievable after heat treatment with the maximum diameter (or cross section) and steel composition having important bearing on what properties are achievable. Please refer to the source BS970 specification or consult a heat treatment specialist for full guidance on limited ruling section.

For guidance only we list below typical mechanical properties achievable when heat treating BS970 specifications. Please refer to the full BS970 specification of each grade for further information.

Condition Tensile
N/mm²		 Yield
N/mm²		 Elongation
%		 Izod
KCV J		 Hardness
Brinell
P 550/700 340 20 28 152/207
Q 625/775 400 18 28 179/227
R 700/850 480 16 28 201/255
S 775/925 525 14 16 223/277
T 850/1000 650 13 35 248/302
U 925/1000 755 12 42 269/331
V 1000/1150 850 12 42 293/352
W 1075/1225 940 11 35 311/375
X 1150/1300 1020 10 28 341/401
Y 1225/1375 1095 10 21 363/429
Z 1550 1235 5 9 444

(*subject to ruling section and specification)

Heat treatment temperatures, including rate of heating, cooling and soaking times will vary due to factors such as the shape and size of each BS970 steel component. Other considerations during the heat treatment process include the type of furnace, quenching medium and work piece transfer facilities. Please consult your heat treatment provider for full guidance on heat treatment of BS970 steel.

We recommend that you contact your welding consumables supplier who should provide you full assistance and information on welding steel grades.

BS970 steel specifications are commonly available with a cast and analysis certificate or a BS EN 10204 3.1 mill certificate, please request when placing any orders.

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