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GB/T 699 30Mn vs GB/T 699 35

Close Alternative — 75.5% match based on chemical composition and mechanical property overlap.

GB/T 699 30Mn (GB/T 699:2015) and GB/T 699 35 (GB/T 699:2015) are both steel grades. Both fall under the Carbon Steel category. GB/T 699 30Mn is typically used for hot-rolled or forged quality carbon structural steel bars up to 250 mm, while GB/T 699 35 is commonly used for used for shafts, connecting rods, bolts, forged parts, gears, and machine components.. GB/T 699 30Mn is defined under Guobiao Standards (GB/T), originating from China, while GB/T 699 35 is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, GB/T 699 30Mn vs GB/T 699 35 is a 88.3% match. As per mechanical properties, the match is 50%. Combined, this makes them a close alternative overall at 75.5%.

Frequently Compared With GB/T 699 30Mn:
BS 970 (Part 1) 040A04 BS 970 (Part 1) 045A10 BS 970 (Part 1) 055M15 BS 970 (Part 1) 040A10 BS 970 (Part 1) 040A12 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) 060A32 BS 970 (Part 1) 060A40
Match Breakdown
CHEMISTRY MATCH
88.3%
MECHANICAL MATCH
50%
OVERALL
75.5%
Specifications
Property GB/T 699 30Mn GB/T 699 35
Standard GB/T 699:2015 GB/T 699:2015
Category Carbon Steel Carbon Steel
C (%) 0.27-0.34 0.32-0.39
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 30Mn GB/T 699 35
Tensile Strength >=540 MPa >=530 MPa
Yield Strength >=315 MPa >=315 MPa
Elongation >=20% >=20%
Hardness <=217 HB (as delivered, not heat treated) <=197 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 30Mn
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
GB/T 699 35
Used for shafts, connecting rods, bolts, forged parts, gears, and machine components.
Can GB/T 699 30Mn Be Substituted With GB/T 699 35?
GB/T 699 30Mn and GB/T 699 35 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.
Forms & Sizes Available on M-EX
GB/T 699 30Mn
No active listings currently.
GB/T 699 35
Round Bar → (2 listings)
Diameter: 40–40 mm (1.57–1.57 in)
Length: 6500–6900 mm (255.91–271.65 in)
On M-EX Right Now
GB/T 699 30Mn
0 active listings and RFQs →
GB/T 699 35
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 699 30Mn and GB/T 699 35?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can GB/T 699 30Mn be substituted with GB/T 699 35?
GB/T 699 30Mn and GB/T 699 35 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.