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| After-sales Service: | 1year |
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| Warranty: | 1year |
| Type: | Alloy Steel Bar |
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40S20 Free-Cutting Steel
40S20 is a high-sulfur medium-carbon free-cutting steel conforming to the European standard (EN), material number 1.0757, equivalent to China's national standard Y40Mn (GB/T 8731).Key advantages: excellent machinability, high strength and hardness, suitable for high-rigidity parts machined on high-speed automatic lathes.
1. Chemical Composition (Mass Fraction %)
| Element | C | Si | Mn | S | P |
| Range | 0.37-0.45 | 0.15-0.35 | 1.20-1.55 | 0.20-0.30 | ≤0.05 |
| Condition | Tensile Strength (MPa) | Elongation δ (%) | Hardness (HB) |
| Hot rolled | 590-735 | ≥14 | ≤207 |
| Cold drawn + tempered | 590-785 | ≥17 | 180-220 |
3. Characteristics & Advantages
Machinability: Significantly improved vs. 45 steel - tool life ×4, machining efficiency +30%
Strength: Higher than Y15/Y20, capable of bearing greater loads
Processability: Smooth surface, stable dimensions, smooth chip flow
Suitability: Automatic lathes, CNC for mass production
4. Typical Applications
Machine tools: lead screws, polished rods, racks, spline shafts, gear shafts
Automotive: drive shafts, bolts, pins, small shafts
Machinery: high-rigidity, high-precision structural parts requiring machining
5. Equivalent Grades
China: Y40Mn (GB/T 8731)
Europe: 40S20 / 1.0757 (EN 10087)
USA: 1144 (AISI)
Japan: SUM42 (JIS)
6. Supply Forms
Round, square, hexagonal, flat bars
Conditions: hot rolled, cold drawn, cold drawn + tempered, peeled, ground
Q1: Why choose us?
A: Our company, as an internationally experienced and professionalsupplier, has been engaged in steel business for more than ten years. Wecan provide a variety of steel products with high quality to our clients.
Q2: Can you provide OEM/ODM service?
A: Yes. Please feel free to contact us for more details
Q3:What is your terms of payment?
A: 100% T/T advance.
30% T/T and balance against copy of documents.
30% T/T advance, balance L/C at sight.
Q4: Can we visit your factory?
A: Warmly welcome. Once we have your schedule, we will arrange theprofessional sales team to follow up your case.
Q5: Can you provide sample?
A: Yes. Sample is free for regular sizes, but the buyer needs to pay freightcost.
Q6: How long is your delivery time?
A: Regular lead time is 15 to 30 days after receiving deposit.
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