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BS 970 (Part 3):1991 321S31 Steel: Specifications & Listings

BS 970 (Part 3):1991 321S31: 321S31 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 321S31
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
NF A35-574 Z7CN18-09 NF A35-574:1990 France 2 listings, 0 RFQs →
ASTM A959 321 ASTM A959:2011 USA No activity yet
ASTM A959 347 ASTM A959:2011 USA No activity yet
BS 970 (Part 1) 321S31 BS 970 (Part 1):1991 UK No activity yet
IS 1570 (Part 5) X04Cr18Ni10Ti IS 1570 (Part 5):1985 India No activity yet
IS 1570 (Part 5) X04Cr18Ni10Nb IS 1570 (Part 5):1985 India No activity yet
EN 10088-1 X6CrNiTi18-10 EN 10088-1:2014 Europe (CEN) No activity yet
EN 10088-1 X6CrNiNb18-10 EN 10088-1:2014 Europe (CEN) No activity yet
ASTM A240/A240M S30500 ASTM A240/A240M:2025 USA No activity yet
ASTM A240/A240M S32100 ASTM A240/A240M:2025 USA No activity yet
ASTM A240/A240M S34700 ASTM A240/A240M:2025 USA No activity yet
ASTM A240/A240M S34800 ASTM A240/A240M:2025 USA No activity yet
ASTM A276/A276M S30800 ASTM A276/A276M:2017 USA No activity yet
IS 6603 X04Cr18Ni12 IS 6603:2024 India No activity yet
EN 10088-3 X6CrNiTi18-10 EN 10088-3:2014 Europe No activity yet
EN 10088-3 X4CrNi18-12 EN 10088-3:2014 Europe No activity yet
EN 10088-3 X6CrNiNb18-10 EN 10088-3:2014 Europe No activity yet
JIS G4304 SUS305 JIS G4304:2021 Japan No activity yet
JIS G4304 SUS321 JIS G4304:2021 Japan No activity yet
JIS G4304 SUS347 JIS G4304:2021 Japan No activity yet
JIS G4304 SUSXM7 JIS G4304:2021 Japan No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
IS 1570 (Part 5) X04Cr18Ni10Ti IS 1570 (Part 5):1985 Strong Match
IS 1570 (Part 5) X04Cr18Ni10Nb IS 1570 (Part 5):1985 Strong Match
IS 11169 (Part 2) X04Cr18Ni10Ti IS 11169 (Part 2):1989 Strong Match
IS 6911 X04Cr18Ni10Ti IS 6911:1992 Strong Match
IS 6911 X04Cr18Ni10Nb IS 6911:1992 Strong Match
ASTM A959 347 ASTM A959:2011 Strong Match
BS 970 (Part 1) 321S31 BS 970 (Part 1):1991 Strong Match
BS 970 (Part 1) 347S31 BS 970 (Part 1):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 Ni
<=0.08 <=1.0 <=2.0 <=0.045 <=0.030 17.0-19.0 9.0-12.0

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
Others
Ti 5C max. 0.80
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
35 %
Rp0.2
200 MPa
Rp1.0, min
235 MPa
Sensitization period
30 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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