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GB/T 3077 18Cr2Ni4W vs BS 970 (Part 3) 431S29

Related Material — 64.4% match based on chemical composition and mechanical property overlap.

GB/T 3077 18Cr2Ni4W (GB/T 3077:2015) and BS 970 (Part 3) 431S29 (BS 970 (Part 3):1991) are both steel grades. GB/T 3077 18Cr2Ni4W is classified under Alloy Steel, while BS 970 (Part 3) 431S29 is classified under Stainless Steel — a different category, which is worth noting alongside the chemistry match below. GB/T 3077 18Cr2Ni4W is typically used for hot-rolled or forged structural alloy steel bars, while BS 970 (Part 3) 431S29 is commonly used for bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; martensitic stainless steel (table 17). GB/T 3077 18Cr2Ni4W is defined under Guobiao Standards (GB/T), originating from China, while BS 970 (Part 3) 431S29 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, GB/T 3077 18Cr2Ni4W vs BS 970 (Part 3) 431S29 is a 64.4% 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 64.4%.

Frequently Compared With GB/T 3077 18Cr2Ni4W:
GB/T 3077 12Cr2Ni4 IS 4367 07Cr4Mo6 IS 4367 10Cr9Mo10 IS 1570 (Part 4) 10Mo6 IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H
Match Breakdown
CHEMISTRY MATCH
64.4%
MECHANICAL MATCH
No shared data
OVERALL
64.4%
Specifications
Property GB/T 3077 18Cr2Ni4W BS 970 (Part 3) 431S29
Standard GB/T 3077:2015 BS 970 (Part 3):1991
Category Alloy Steel Stainless Steel
C (%) 0.13-0.19 0.12-0.20
Si (%) 0.17-0.37 <=1.0
Mn (%) 0.30-0.60 <=1.0
Cr (%) 1.35-1.65 15.0-18.0
Ni (%) 4.00-4.50 2.0-3.0
W (%) 0.80-1.20 Not specified
P (%) <=0.030 <=0.040
S (%) <=0.030 <=0.030
Cu (%) <=0.30 Not specified
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property GB/T 3077 18Cr2Ni4W BS 970 (Part 3) 431S29
Tensile Strength >=1180 MPa Not specified
Yield Strength >=835 MPa Not specified
Elongation >=10% Not specified
Hardness <=269 HB Not specified
Condition Quenched and tempered, test sample 15 mm; hardness is for bars delivered annealed or high temperature tempered Not specified
Typical Applications
GB/T 3077 18Cr2Ni4W
Hot-rolled or forged structural alloy steel bars
BS 970 (Part 3) 431S29
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; martensitic stainless steel (Table 17)
Key Differences
Can GB/T 3077 18Cr2Ni4W Be Substituted With BS 970 (Part 3) 431S29?
GB/T 3077 18Cr2Ni4W and BS 970 (Part 3) 431S29 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.
On M-EX Right Now
GB/T 3077 18Cr2Ni4W
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BS 970 (Part 3) 431S29
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Frequently Asked Questions
What is the difference between GB/T 3077 18Cr2Ni4W and BS 970 (Part 3) 431S29?
Different category: GB/T 3077 18Cr2Ni4W is Alloy Steel, BS 970 (Part 3) 431S29 is Stainless Steel. GB/T 3077 18Cr2Ni4W specifies W, Cu which are not specified for BS 970 (Part 3) 431S29.
Can GB/T 3077 18Cr2Ni4W be substituted with BS 970 (Part 3) 431S29?
GB/T 3077 18Cr2Ni4W and BS 970 (Part 3) 431S29 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.