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GB/T 699 20Mn vs BS 970 (Part 1) 637M17

Related Material — 65% match based on chemical composition and mechanical property overlap.

GB/T 699 20Mn (GB/T 699:2015) and BS 970 (Part 1) 637M17 (BS 970 (Part 1):1983) are both steel grades. GB/T 699 20Mn is classified under Carbon Steel, while BS 970 (Part 1) 637M17 is classified under Alloy Steel — a different category, which is worth noting alongside the chemistry match below. GB/T 699 20Mn is typically used for hot-rolled or forged quality carbon structural steel bars up to 250 mm, while BS 970 (Part 1) 637M17 is commonly used for case hardening steel for mechanical and allied engineering purposes (table 11 mechanical properties).. GB/T 699 20Mn is defined under Guobiao Standards (GB/T), originating from China, while BS 970 (Part 1) 637M17 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, GB/T 699 20Mn vs BS 970 (Part 1) 637M17 is a 65.9% 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 65%.

Frequently Compared With GB/T 699 20Mn:
BS 970 (Part 1) 060A45 BS 970 (Part 1) 040A04 BS 970 (Part 1) 040A10 BS 970 (Part 1) 040A12 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 055M15 BS 970 (Part 1) 060A32
Match Breakdown
CHEMISTRY MATCH
65.9%
MECHANICAL MATCH
No shared data
OVERALL
65%
Specifications
Property GB/T 699 20Mn BS 970 (Part 1) 637M17
Standard GB/T 699:2015 BS 970 (Part 1):1983
Category Carbon Steel Alloy Steel
C (%) 0.17-0.23 0.14-0.20
Si (%) 0.17-0.37 Not specified
Mn (%) 0.70-1.00 0.60-0.90
P (%) <=0.035 <=0.035
S (%) <=0.035 <=0.040
Cr (%) <=0.25 0.60-1.00
Ni (%) <=0.30 0.85-1.25
Cu (%) <=0.25 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 699 20Mn BS 970 (Part 1) 637M17
Tensile Strength >=450 MPa Not specified
Yield Strength >=275 MPa Not specified
Elongation >=24% Not specified
Hardness <=197 HB (as delivered, not heat treated) Not specified
Condition Normalized 25 mm sample blank, bars up to 80 mm; hardness for delivery state Not specified
Typical Applications
GB/T 699 20Mn
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
BS 970 (Part 1) 637M17
Case hardening steel for mechanical and allied engineering purposes (Table 11 mechanical properties).
Key Differences
Can GB/T 699 20Mn Be Substituted With BS 970 (Part 1) 637M17?
GB/T 699 20Mn and BS 970 (Part 1) 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 699 20Mn
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BS 970 (Part 1) 637M17
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Frequently Asked Questions
What is the difference between GB/T 699 20Mn and BS 970 (Part 1) 637M17?
Different category: GB/T 699 20Mn is Carbon Steel, BS 970 (Part 1) 637M17 is Alloy Steel. GB/T 699 20Mn specifies Si, Cu which are not specified for BS 970 (Part 1) 637M17.
Can GB/T 699 20Mn be substituted with BS 970 (Part 1) 637M17?
GB/T 699 20Mn and BS 970 (Part 1) 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.