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GB/T 699 40 vs GB/T 699 35Mn

Related Material — 67.2% match based on chemical composition and mechanical property overlap.

GB/T 699 40 (GB/T 699:2015) and GB/T 699 35Mn (GB/T 699:2015) are both steel grades. Both fall under the Carbon Steel category. GB/T 699 40 is typically used for used for gears, shafts, axles, crankshafts, couplings, and machine spindles., while GB/T 699 35Mn is commonly used for hot-rolled or forged quality carbon structural steel bars up to 250 mm. GB/T 699 40 is defined under Guobiao Standards (GB/T), originating from China, while GB/T 699 35Mn is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, GB/T 699 40 vs GB/T 699 35Mn is a 88.3% match. As per mechanical properties, the match is 25%. Combined, this makes them a related material overall at 67.2%.

Frequently Compared With GB/T 699 40:
BS 970 (Part 1) 040A10 BS 970 (Part 3) 070M55 BS 970 (Part 1) 040A04 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 060A40 BS 970 (Part 1) 040A12 BS 970 (Part 3) 045M10 BS 970 (Part 1) 055M15 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 045M10
Match Breakdown
CHEMISTRY MATCH
88.3%
MECHANICAL MATCH
25%
OVERALL
67.2%
Specifications
Property GB/T 699 40 GB/T 699 35Mn
Standard GB/T 699:2015 GB/T 699:2015
Category Carbon Steel Carbon Steel
C (%) 0.37-0.44 0.32-0.39
Si (%) 0.17-0.37 0.17-0.37
Mn (%) 0.50-0.80 0.70-1.00
P (%) <=0.035 <=0.035
S (%) <=0.035 <=0.035
Cr (%) <=0.25 <=0.25
Ni (%) <=0.30 <=0.30
Cu (%) <=0.25 <=0.25
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 40 GB/T 699 35Mn
Tensile Strength >=570 MPa >=560 MPa
Yield Strength >=335 MPa >=335 MPa
Elongation >=19% >=18%
Hardness <=217 HB (as delivered, not heat treated) <=229 HB (as delivered, not heat treated)
Condition Normalized 25 mm sample blank, bars up to 80 mm; hardness for delivery state Normalized 25 mm sample blank, bars up to 80 mm; hardness for delivery state
Typical Applications
GB/T 699 40
Used for gears, shafts, axles, crankshafts, couplings, and machine spindles.
GB/T 699 35Mn
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
Can GB/T 699 40 Be Substituted With GB/T 699 35Mn?
GB/T 699 40 and GB/T 699 35Mn 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
GB/T 699 40
Round Bar → (2 listings)
Diameter: 40–40 mm (1.57–1.57 in)
Length: 5000–7000 mm (196.85–275.59 in)
GB/T 699 35Mn
No active listings currently.
On M-EX Right Now
GB/T 699 40
2 active listings and RFQs →
GB/T 699 35Mn
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Frequently Asked Questions
What is the difference between GB/T 699 40 and GB/T 699 35Mn?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can GB/T 699 40 be substituted with GB/T 699 35Mn?
GB/T 699 40 and GB/T 699 35Mn 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.