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GB/T 3077 40CrNi vs BS 970 (Part 3) 637M17

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

GB/T 3077 40CrNi (GB/T 3077:2015) and BS 970 (Part 3) 637M17 (BS 970 (Part 3):1991) are both steel grades. Both fall under the Alloy Steel category. GB/T 3077 40CrNi is typically used for hot-rolled or forged structural alloy steel bars, while BS 970 (Part 3) 637M17 is commonly used for bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy case hardening steel (table 15). GB/T 3077 40CrNi is defined under Guobiao Standards (GB/T), originating from China, while BS 970 (Part 3) 637M17 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, GB/T 3077 40CrNi vs BS 970 (Part 3) 637M17 is a 71.5% 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 GB/T 3077 40CrNi:
UNI 11234 100Cr6 EN 10028-2 10CrMo9-10 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Mo6 IS 1570 (Part 7) 10Mo6H IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H
Match Breakdown
CHEMISTRY MATCH
71.5%
MECHANICAL MATCH
No shared data
OVERALL
69.9%
Specifications
Property GB/T 3077 40CrNi BS 970 (Part 3) 637M17
Standard GB/T 3077:2015 BS 970 (Part 3):1991
Category Alloy Steel Alloy Steel
C (%) 0.37-0.44 0.14-0.20
Si (%) 0.17-0.37 0.10-0.40
Mn (%) 0.50-0.80 0.60-0.90
Cr (%) 0.45-0.75 0.60-1.00
Ni (%) 1.00-1.40 0.85-1.25
P (%) <=0.030 <=0.04
S (%) <=0.030 <=0.05
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 40CrNi BS 970 (Part 3) 637M17
Tensile Strength >=980 MPa Not specified
Yield Strength >=785 MPa Not specified
Elongation >=10% Not specified
Hardness <=241 HB Not specified
Condition Quenched and tempered, test sample 25 mm; hardness is for bars delivered annealed or high temperature tempered Not specified
Typical Applications
GB/T 3077 40CrNi
Hot-rolled or forged structural alloy steel bars
BS 970 (Part 3) 637M17
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy case hardening steel (Table 15)
Key Differences
Can GB/T 3077 40CrNi Be Substituted With BS 970 (Part 3) 637M17?
GB/T 3077 40CrNi and BS 970 (Part 3) 637M17 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.
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GB/T 3077 40CrNi
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BS 970 (Part 3) 637M17
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Frequently Asked Questions
What is the difference between GB/T 3077 40CrNi and BS 970 (Part 3) 637M17?
GB/T 3077 40CrNi specifies Cu which is not specified for BS 970 (Part 3) 637M17.
Can GB/T 3077 40CrNi be substituted with BS 970 (Part 3) 637M17?
GB/T 3077 40CrNi and BS 970 (Part 3) 637M17 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.