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ASTM A240/A240M S21400 vs ASTM A959 SS304

Related Material — 69.9% match based on chemical composition and mechanical property overlap.

ASTM A240/A240M S21400 (ASTM A240/A240M:2025) and ASTM A959 SS304 (ASTM A959:2011) are both steel grades. Both fall under the Stainless Steel category. ASTM A240/A240M S21400 is typically used for pressure vessels and general applications (plate, sheet and strip), while ASTM A959 SS304 is commonly used for food processing, chemical equipment, kitchen equipment. ASTM A240/A240M S21400 is defined under ASTM International, originating from United States, while ASTM A959 SS304 is defined under ASTM International, originating from United States.

As per chemical composition, ASTM A240/A240M S21400 vs ASTM A959 SS304 is a 70.4% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a related material overall at 69.9%.

Frequently Compared With ASTM A240/A240M S21400:
GOST 5632 06Kh23N28 EN 10088-1 1.4401 EN 10088-1 1.4845 GB/T 3280 06Cr19Ni10 GOST 5632 08X18H10 EN 10088-1 1.4006 EN 10088-1 1.4301 IS 1570 (Part 7) 11Cr17Ni13W3TiH IS 1570 (Part 7) 12Cr12MoH IS 1570 (Part 7) 12Cr12MoVH IS 1570 (Part 7) 12Cr12Ni2Mo ASTM A959 .-
Match Breakdown
CHEMISTRY MATCH
70.4%
MECHANICAL MATCH
No shared data
OVERALL
69.9%
Specifications
Property ASTM A240/A240M S21400 ASTM A959 SS304
Standard ASTM A240/A240M:2025 ASTM A959:2011
Category Stainless Steel Stainless Steel
C (%) <=0.12 <=0.07
Mn (%) 14.00-16.00 <=2.00
P (%) <=0.045 <=0.045
S (%) <=0.030 <=0.030
Si (%) 0.30-1.00 <=1.00
Cr (%) 17.0-18.5 17.5-19.5
Ni (%) <=1.00 8.0-11.0
N (%) >=0.35 Not specified
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Typical Applications
ASTM A240/A240M S21400
Pressure vessels and general applications (plate, sheet and strip)
ASTM A959 SS304
Food processing, chemical equipment, kitchen equipment
Key Differences
Can ASTM A240/A240M S21400 Be Substituted With ASTM A959 SS304?
ASTM A240/A240M S21400 and ASTM A959 SS304 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.
Forms & Sizes Available on M-EX
ASTM A240/A240M S21400
No active listings currently.
ASTM A959 SS304
Sheet → (22 listings)
Thickness: 2–6 mm (0.08–0.24 in)
Width: 1250–1250 mm (49.21–49.21 in)
Length: 2500–4100 mm (98.43–161.42 in)
Round Bar → (6 listings)
Diameter: 50–65 mm (1.97–2.56 in)
Length: 2500–6900 mm (98.43–271.65 in)
Plate → (6 listings)
Thickness: 8–12 mm (0.31–0.47 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2500–3800 mm (98.43–149.61 in)
On M-EX Right Now
ASTM A240/A240M S21400
0 active listings and RFQs →
ASTM A959 SS304
34 active listings and RFQs →
Frequently Asked Questions
What is the difference between ASTM A240/A240M S21400 and ASTM A959 SS304?
ASTM A240/A240M S21400 specifies N which is not specified for ASTM A959 SS304.
Can ASTM A240/A240M S21400 be substituted with ASTM A959 SS304?
ASTM A240/A240M S21400 and ASTM A959 SS304 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.