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GB/T 699 70Mn vs GB/T 699 65Mn

Close Alternative — 70.6% match based on chemical composition and mechanical property overlap.

GB/T 699 70Mn (GB/T 699:2015) and GB/T 699 65Mn (GB/T 699:2015) are both steel grades. Both fall under the Carbon Steel category. GB/T 699 70Mn is typically used for hot-rolled or forged quality carbon structural steel bars up to 250 mm, while GB/T 699 65Mn is commonly used for hot-rolled or forged quality carbon structural steel bars up to 250 mm. GB/T 699 70Mn is defined under Guobiao Standards (GB/T), originating from China, while GB/T 699 65Mn is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, GB/T 699 70Mn vs GB/T 699 65Mn is a 93.4% match. As per mechanical properties, the match is 25%. Combined, this makes them a close alternative overall at 70.6%.

Frequently Compared With GB/T 699 70Mn:
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 BS 970 (Part 1) 060A40
Match Breakdown
CHEMISTRY MATCH
93.4%
MECHANICAL MATCH
25%
OVERALL
70.6%
Specifications
Property GB/T 699 70Mn GB/T 699 65Mn
Standard GB/T 699:2015 GB/T 699:2015
Category Carbon Steel Carbon Steel
C (%) 0.67-0.75 0.62-0.70
Si (%) 0.17-0.37 0.17-0.37
Mn (%) 0.90-1.20 0.90-1.20
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 70Mn GB/T 699 65Mn
Tensile Strength >=785 MPa >=735 MPa
Yield Strength >=450 MPa >=430 MPa
Elongation >=8% >=9%
Hardness <=285 HB (as delivered, not heat treated) <=285 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 70Mn
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
GB/T 699 65Mn
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
Can GB/T 699 70Mn Be Substituted With GB/T 699 65Mn?
GB/T 699 70Mn and GB/T 699 65Mn are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
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GB/T 699 70Mn
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GB/T 699 65Mn
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Frequently Asked Questions
What is the difference between GB/T 699 70Mn and GB/T 699 65Mn?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can GB/T 699 70Mn be substituted with GB/T 699 65Mn?
GB/T 699 70Mn and GB/T 699 65Mn are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.