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UNI 6900 X5CrNi1810 vs BS 970 (Part 3) 304S31

Strong Match — 93.9% match based on chemical composition and mechanical property overlap.

UNI 6900 X5CrNi1810 (UNI 6900:1971) and BS 970 (Part 3) 304S31 (BS 970 (Part 3):1991) are both steel grades. Both fall under the Stainless Steel category. UNI 6900 X5CrNi1810 is typically used for used in kitchen equipment, chemical tanks, piping, architectural panels, food processing equipment, and fasteners., while BS 970 (Part 3) 304S31 is commonly used for bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; austenitic stainless and heat resisting steel (table 18). UNI 6900 X5CrNi1810 is defined under Ente Nazionale Italiano di Unificazione (UNI), originating from Italy, while BS 970 (Part 3) 304S31 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, UNI 6900 X5CrNi1810 vs BS 970 (Part 3) 304S31 is a 93.9% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a strong match overall at 93.9%.

Frequently Compared With UNI 6900 X5CrNi1810:
GOST 5632 06Kh23N28 GB/T 3280 06Cr19Ni10 GOST 5632 12Kh13 GOST 5632 08X18H10 EN 10088-1 1.4301 EN 10088-1 1.4845 EN 10088-1 1.4401 EN 10088-1 1.4006 IS 1570 (Part 7) 12Cr12Ni2Mo ASTM A959 .- IS 1570 (Part 7) 11Cr17Ni13W3TiH IS 1570 (Part 7) 12Cr12MoH
Match Breakdown
CHEMISTRY MATCH
93.9%
MECHANICAL MATCH
No shared data
OVERALL
93.9%
Specifications
Property UNI 6900 X5CrNi1810 BS 970 (Part 3) 304S31
Standard UNI 6900:1971 BS 970 (Part 3):1991
Category Stainless Steel Stainless Steel
C (%) 0.07 max <=0.07
Si (%) 1.00 max <=1.0
Mn (%) 2.00 max <=2.0
P (%) 0.045 max <=0.045
S (%) 0.015 max <=0.030
Cr (%) 17.50-19.50 17.0-19.0
Ni (%) 8.00-10.50 8.0-11.0
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property UNI 6900 X5CrNi1810 BS 970 (Part 3) 304S31
Tensile Strength 520-720 MPa Not specified
Yield Strength 210 MPa min Not specified
Elongation 45% min Not specified
Hardness 187 HB max Not specified
Typical Applications
UNI 6900 X5CrNi1810
Used in kitchen equipment, chemical tanks, piping, architectural panels, food processing equipment, and fasteners.
BS 970 (Part 3) 304S31
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; austenitic stainless and heat resisting steel (Table 18)
Can UNI 6900 X5CrNi1810 Be Substituted With BS 970 (Part 3) 304S31?
UNI 6900 X5CrNi1810 and BS 970 (Part 3) 304S31 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 304S31 is often considered as a substitute for UNI 6900 X5CrNi1810 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
Forms & Sizes Available on M-EX
UNI 6900 X5CrNi1810
Sheet → (2 listings)
Thickness: 6–6 mm (0.24–0.24 in)
Width: 1250–1250 mm (49.21–49.21 in)
Length: 2600–3700 mm (102.36–145.67 in)
BS 970 (Part 3) 304S31
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On M-EX Right Now
UNI 6900 X5CrNi1810
2 active listings and RFQs →
BS 970 (Part 3) 304S31
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Frequently Asked Questions
What is the difference between UNI 6900 X5CrNi1810 and BS 970 (Part 3) 304S31?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can UNI 6900 X5CrNi1810 be substituted with BS 970 (Part 3) 304S31?
UNI 6900 X5CrNi1810 and BS 970 (Part 3) 304S31 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 304S31 is often considered as a substitute for UNI 6900 X5CrNi1810 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.