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BS 970 (Part 1):1991 304S31 Steel: Specifications & Listings

BS 970 (Part 1):1991 304S31: 304S31 is a austenitic steel specified in BS 970 Part 1:1991 (category 1).

Category: Stainless Steel
Grade Details
GradeBS 970 (Part 1):1991 304S31
Standard BS 970 (Part 1):1991
ApplicationsAustenitic stainless and heat resisting steel (section five)
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
BS 970 (Part 3) 304S31 BS 970 (Part 3):1991 UK No activity yet
ASTM A959 SS304 ASTM A959:2011 USA 16 listings, 18 RFQs →
ASTM A959 347 ASTM A959:2011 USA 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 A959 321 ASTM A959:2011 USA No activity yet
EN 10088-1 X8CrNiTi18-10 EN 10088-1:2014 Europe (CEN) No activity yet
EN 10088-1 X6CrNi18-10 EN 10088-1:2014 Europe (CEN) No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
BS 970 (Part 3) 304S31 BS 970 (Part 3):1991 Strong Match
BS 970 (Part 1) 304S31 BS 970 (Part 1):1983 Strong Match
ASTM A959 SS304 ASTM A959:2011 Strong Match
BS 970 (Part 3) 304S15 BS 970 (Part 3):1991 Strong Match
BS 970 (Part 1) 304S15 BS 970 (Part 1):1983 Strong 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
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
<=0.07 <=1.0 <=2.0 <=0.045 <=0.030 17.0-19.0 8.0-11.0
Mechanical Properties
Condition Softened, 1000-1100 deg C
Tensile Strength 490 MPa min
Yield Strength 195 MPa min (0.2% proof)
Elongation 40 % 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)
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
490 MPa
Elongation, min
40 %
Rp0.2, min (when specified)
195 MPa
Rp1.0, min (when specified)
230 MPa
Sensitization period (see 1.15.6)
15 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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