Available Shapes
BS970 Steel Specifications
Nifty Alloys LLC are suppliers of BS970 specifications in round bar, flat bar, and steel plate. BS970 steel grades are commonly carbon and alloy steels that 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 Although still commonly produced to BS970 designations most carbon and alloy grades have officially been superseded by new BS EN steel standards such as BS EN 10083, BS EN 10088 and BS EN 10277.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.
Steel Names
Specifications
Limited Ruling Section
Typical Mechanical Properties
Heat Treatment
Heat Treatment
Welding
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.
Specifications
Limited Ruling Section
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.
Typical Mechanical Properties
or 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 |
Heat Treatment
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.
Heat Treatment
When heat treating BS4659 grades consideration should be given to hardening temperatures, including rate of heating, cooling and soaking times which will vary due to factors such as the shape and size of each component. Other considerations during heat treatment 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 BS4659 specifications.
Welding
We recommend that you contact your welding consumables supplier who should provide you full assistance and information on welding steel grades.
We never share your information