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GB/T 699 20Mn vs GB/T 699 25

Close Alternative — 80.6% match based on chemical composition and mechanical property overlap.

GB/T 699 20Mn (GB/T 699:2015) and GB/T 699 25 (GB/T 699:2015) are both steel grades. Both fall under the Carbon Steel category. GB/T 699 20Mn is typically used for hot-rolled or forged quality carbon structural steel bars up to 250 mm, while GB/T 699 25 is commonly used for hot-rolled or forged quality carbon structural steel bars up to 250 mm. GB/T 699 20Mn is defined under Guobiao Standards (GB/T), originating from China, while GB/T 699 25 is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, GB/T 699 20Mn vs GB/T 699 25 is a 87.6% match. As per mechanical properties, the match is 66.7%. Combined, this makes them a close alternative overall at 80.6%.

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
87.6%
MECHANICAL MATCH
66.7%
OVERALL
80.6%
Specifications
Property GB/T 699 20Mn GB/T 699 25
Standard GB/T 699:2015 GB/T 699:2015
Category Carbon Steel Carbon Steel
C (%) 0.17-0.23 0.22-0.29
Si (%) 0.17-0.37 0.17-0.37
Mn (%) 0.70-1.00 0.50-0.80
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 20Mn GB/T 699 25
Tensile Strength >=450 MPa >=450 MPa
Yield Strength >=275 MPa >=275 MPa
Elongation >=24% >=23%
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 Normalized 25 mm sample blank, bars up to 80 mm; hardness for delivery state
Typical Applications
GB/T 699 20Mn
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
GB/T 699 25
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
Can GB/T 699 20Mn Be Substituted With GB/T 699 25?
GB/T 699 20Mn and GB/T 699 25 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 20Mn
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GB/T 699 25
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Frequently Asked Questions
What is the difference between GB/T 699 20Mn and GB/T 699 25?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can GB/T 699 20Mn be substituted with GB/T 699 25?
GB/T 699 20Mn and GB/T 699 25 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.