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BS 970 (Part 1):1991 321S31 Steel: Specifications & Listings

BS 970 (Part 1):1991 321S31: 321S31 is a austenitic steel specified in BS 970 Part 1:1991 (category 1).

Category: Stainless Steel
Grade Details
GradeBS 970 (Part 1):1991 321S31
Standard BS 970 (Part 1):1991
ApplicationsAustenitic stainless and heat resisting steel (section five)
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
ASTM A959 308 ASTM A959:2011 USA No activity yet
ASTM A959 321 ASTM A959:2011 USA No activity yet
ASTM A959 347 ASTM A959:2011 USA No activity yet
ASTM A959 348 ASTM A959:2011 USA No activity yet
BS 970 (Part 3) 321S31 BS 970 (Part 3):1991 UK 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
EN 10088-1 X8CrNiTi18-10 EN 10088-1:2014 Europe (CEN) No activity yet
EN 10088-1 X6CrNiTiB18-10 EN 10088-1:2014 Europe (CEN) No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
ASTM A959 347 ASTM A959:2011 Strong Match
BS 970 (Part 3) 321S31 BS 970 (Part 3):1991 Strong Match
BS 970 (Part 3) 347S31 BS 970 (Part 3):1991 Strong Match
BS 970 (Part 1) 321S31 BS 970 (Part 1):1983 Strong Match
BS 970 (Part 1) 347S31 BS 970 (Part 1):1983 Strong Match
EN 10088-1 X6CrNiTi18-10 EN 10088-1:2014 Strong Match
EN 10088-1 X6CrNiNb18-10 EN 10088-1:2014 Strong Match
EN 10088-1 X6CrNiTi18-10 EN 10088-1:2023 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
Mechanical Properties
Condition Softened, 1000-1100 deg C
Tensile Strength 510 MPa min
Yield Strength 200 MPa min (0.2% proof)
Elongation 35 % min
Hardness 183 HB max

More data from BS 970 (Part 1):1991

From the standard
Other composition limits
Category
Category 1 steel (note 7)
Other limits
Ti 5C-0.80
Maximum unless a range is stated.
Source: BS 970 (Part 1):1991, Table 11
Properties in the softened condition
Softening temperature
1000-1100 deg C
Maximum section
160 mm
Tensile strength, min
510 MPa
Elongation, min
35 %
Rp0.2, min (when specified)
200 MPa
Rp1.0, min (when specified)
235 MPa
Sensitization period (see 1.15.6)
30 min
Hardness, max
183 HB
Straightening by reeling or cold rectification can increase the surface hardness above the specified maximum (note 36). 1 N/mm2 = 1 MPa.
Source: BS 970 (Part 1):1991, Table 11

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