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BS 970 (Part 3):1991 303S31 Steel: Specifications & Listings

BS 970 (Part 3):1991 303S31: 303S31 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 303S31
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
ASTM A959 303 ASTM A959:2011 USA No activity yet
IS 1570 (Part 5) X07Cr18Ni9 IS 1570 (Part 5):1985 India No activity yet
IS 6603 X10Cr18Ni9S IS 6603:2024 India No activity yet
ASTM A959 303Se ASTM A959:2011 USA No activity yet
EN 10088-1 X9CrNi18-9 EN 10088-1:2014 Europe (CEN) No activity yet
EN 10088-3 X9CrNi18-9 EN 10088-3:2014 Europe No activity yet
EN 10088-1 X8CrNiS18-9 EN 10088-1:2014 Europe (CEN) No activity yet
EN 10088-3 X8CrNiS18-9 EN 10088-3:2014 Europe No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
BS 970 (Part 3) 303S42 BS 970 (Part 3):1991 Strong Match
BS 970 (Part 1) 302S31 BS 970 (Part 1):1991 Strong Match
BS 970 (Part 1) 325S31 BS 970 (Part 1):1991 Strong Match
BS 970 (Part 3) 302S31 BS 970 (Part 3):1991 Strong Match
BS 970 (Part 3) 325S31 BS 970 (Part 3):1991 Strong Match
BS 970 (Part 1) 302S31 BS 970 (Part 1):1983 Strong Match
BS 970 (Part 1) 325S31 BS 970 (Part 1):1983 Strong Match
IS 1570 (Part 5) X07Cr18Ni9 IS 1570 (Part 5):1985 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
<=0.12 <=1.0 <=2.0 <=0.060 0.15-0.35 17.0-19.0 8.0-10.0

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
Molybdenum
1.00 max. (optional addition, note 9)
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
190 MPa
Rp1.0, min
225 MPa
Sensitization period
Not stated
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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