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BS 970 (Part 3):1991 316S31 Steel: Specifications & Listings

BS 970 (Part 3):1991 316S31: 316S31 is a stainless steel bright bar grade specified in BS 970 Part 3:1991 (bright bars for general engineering purposes).

Category: Stainless Steel
Grade Details
GradeBS 970 (Part 3):1991 316S31
Standard BS 970 (Part 3):1991
ApplicationsBright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; austenitic stainless and heat resisting steel (Table 18)
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
IS 1570 (Part 7) 6Cr17Ni12Mo2H IS 1570 (Part 7):1992 India No activity yet
BS 970 (Part 1) 316S31 BS 970 (Part 1):1991 UK No activity yet
EN 10088-1 X6CrNiMoTi17-12-2 EN 10088-1:2014 Europe (CEN) No activity yet
EN 10088-1 X6CrNiMoNb17-12-2 EN 10088-1:2014 Europe (CEN) No activity yet
IS 11169 (Part 2) X04Cr17Ni12Mo2Ti IS 11169 (Part 2):2023 India No activity yet
EN 10088-3 X5CrNiMo17-12-2 EN 10088-3:2014 Europe No activity yet
EN 10088-3 X6CrNiMoTi17-12-2 EN 10088-3:2014 Europe No activity yet
EN 10088-1 X5CrNiMo17-12-2 EN 10088-1:2014 Europe (CEN) 3 listings, 0 RFQs →
IS 6603 X04Cr17Ni12Mo2 IS 6603:2024 India No activity yet
EN 10088-3 X6CrNiMoNb17-12-2 EN 10088-3:2014 Europe No activity yet
JIS G4304 SUS316J1 JIS G4304:2021 Japan No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
BS 970 (Part 1) 316S31 BS 970 (Part 1):1991 Strong Match
BS 970 (Part 1) 316S31 BS 970 (Part 1):1983 Strong Match
EN 10088-1 X6CrNiMoTi17-12-2 EN 10088-1:2014 Strong Match
EN 10088-1 X6CrNiMoNb17-12-2 EN 10088-1:2014 Strong Match
EN 10088-1 X6CrNiMoTi17-12-2 EN 10088-1:2023 Strong Match
EN 10088-1 X6CrNiMoNb17-12-2 EN 10088-1:2023 Strong Match
BS 970 (Part 1) 320S31 BS 970 (Part 1):1991 Strong Match
BS 970 (Part 3) 320S31 BS 970 (Part 3):1991 Strong Match
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C Si Mn P S Cr Mo Ni
<=0.07 <=1.0 <=2.0 <=0.045 <=0.030 16.5-18.5 2.00-2.50 10.5-13.5

More data from BS 970 (Part 3):1991

From the standard
Other composition limits
Steel group
Austenitic stainless and heat resisting steel (Table 18)
Condition of supply
Bright bars: cold drawn, turned or precision ground, in straight lengths
Maximum unless a range is stated.
Source: BS 970 (Part 3):1991, Table 18
Properties in the finally softened condition
Tensile strength Rm, min
510 MPa
Elongation, min
40 %
Rp0.2
205 MPa
Rp1.0, min
240 MPa
Sensitization period
15 min
Applicable to sections up to 160 mm softened at 1000 to 1100 deg C (Table 24, note a). For magnetic properties see option A.2. Sensitization period per clause 8.6 and option A.4.
Source: BS 970 (Part 3):1991, Table 24

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