BS 6744 Chemical Composition and Mechanical Properties
BS 6744 stainless steel bars for the reinforcement of and use in concrete. 2009 version is substantially the same as the 2001 edition but with the addition of 2 lean duplex steels 1.4162 and 1.4362. These steels have the benefit of having a lower nickel content than the standard austenitic grades such as 1.4301 and 1.4401. They are therefore less prone to large variations in price.
The grade designations are harmonized with the European steel number system, but currently there is no European standard for these products.
The steels included in BS 6744 can also be found in EN 10088-3. The specified composition ranges are the same, but with some differences in the number of decimal places for the percentages of some elements shown. The ranges are however shown in this article. The tensile properties are also included in this article, but these are not expressed in the same way as in EN 10088-3, the general standard for stainless steel bars. The strength levels for bars to BS 6744 are expressed as the 'Grade' and indicate the proof strength of the steel. Guidance on steel number selection in a range of service environments is given in Annex B of the standard.
BS 6744 chemical composition table
| Grade |
| Chemical composition (% by mass - max unless stated) |
| - |
C |
Si |
Mn |
S |
Cr |
Ni |
Mo |
P |
N |
| 1.4301 |
0.07 |
1.0 |
2.0 |
0.03 |
17.0/19.5 |
8.0/10.5 |
- |
0.045 |
0.11 |
| 1.4436 |
0.05 |
1.0 |
2.0 |
0.015 |
16.5/18.5 |
10.5/13.0 |
2.5/3.0 |
0.045 |
0.11 |
| 1.4429 |
0.03 |
1.0 |
2.0 |
0.015 |
16.5/18.5 |
11.0/14.0 |
2.5/3.0 |
0.045 |
0.12/0.22 |
| 1.4162 |
0.04 |
1.0 |
4.0/6.0 |
0.015 |
21.0/22.0 |
1.35/1.75 |
0.1/0.8 |
0.040 |
0.20/0.25 |
| 1.4362 |
0.03 |
1.0 |
2.0 |
0.015 |
22.0/24.0 |
3.5/5.5 |
0.1/0.6 |
0.035 |
0.05/0.20 |
| 1.4462 |
0.03 |
1.0 |
2.0 |
0.015 |
21.0/23.0 |
4.5/6.5 |
2.5/3.5 |
0.035 |
0.10/0.22 |
| 1.4501 |
0.03 |
1.0 |
1.0 |
0.015 |
24.0/26.0 |
6.0/8.0 |
3.0/4.0 |
0.035 |
0.20/0.30 |
| 1.4529 |
0.02 |
0.50 |
1.0 |
0.010 |
19.0/21/0 |
24.0/26.0 |
6.0/7.0 |
0.030 |
0.15/0.25 |
Note
Nitrogen contents of grades 1.4301 and 1.4436 may be increased to 0.22% max
BS 6744 tensile property table
| Grade |
| Tensile Properties (min unless stated) |
| - |
0.2% Proof strength, Rp0.2 |
Stress Ratio, Rm/Rp0.2 |
Elongation at fracture, A5 |
Total elongation at maximum force, Agt |
| |
| 200 |
200 |
1.10 |
22 |
5 |
| 500 |
500 |
1.10 |
14 |
5 |
| 650 |
650 |
1.10 |
14 |
5 |
Note
Units are MPa (N/mm2)
Elongation values are percentages (%) (Elongation is A5, total is Agt)
Related References:
1. British Standard BS for Stainless Steel for General Application
2. British Standard for Welding and Fabrication of Stainless Steel
3. BS ASTM Tolerances Surface Finish and Test of Stainless Steel
4. British EN Standard Strength of Steel
5. BS Pipe Tube and Fitting Standard and Specification
6. BS ASTM Tolerances Surface Finish and Test of Stainless Steel
7. EN ASTM Stainless Steel for Pressure Vessel Application
9. BS Aerospace S100 Chemical Composition Mechanical Properties
10. BS Aerospace S500 Chemical Composition Mechanical Properties
11. BS 3100 Chemical Composition of Stainless Steel
12. BS 3100 1991 Cast Steel Chemical Composition
13. BS 970 Stainless Steel Chemical Composition
14. BS 6744 Chemical Composition and Mechanical Properties of stainless steel
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