| Category | Content |
|---|---|
| Material Types & Standards | - Mild Steel: ASTM A36 (Round bar, equivalent to GB Q235), EN 10025-2 C22 (equivalent to GB 20#) - Medium Carbon Steel: ASTM A108 1045 (equivalent to EN C45E) - Free-Cutting Steel: ASTM A29 12L14 (Pb 0.15–0.35%, equivalent to EN 10277-3 1.0718) |
| Dimensions | - Hot-Rolled Round Bar: Ø10–300 mm, Length 3000–6000 mm - Cold-Drawn Precision Bar: Ø3–50 mm, Tolerance ±0.03 mm - Hex/Square Bar: Edge 5–100 mm |
| Advantages | - 1045/C45E: Hardness HRC 25–35 (after quenching & tempering), good wear resistance; Tensile strength 600–800 MPa - 12L14: Excellent machinability (Ra 1.6 μm), ideal for high-speed automated processing |
| Applications | - Shaft components (1045 round bar) - Bolt/nut blanks (A36 hex bar) - Precision instrument parts (12L14 cold-drawn bar) |
| Common Domestic and International Steel Grade Comparison Tables | |||||||
| Product Name | China (GB) | USA (ASTM) | Japan (JIS) | Germany (DIN/DINEN) | UK (BS/BSEN) | France (NF/NFEN) | (ISO) |
| Carbon Structural Steel (Ordinary Grade) | Q195 | Cr.B, Cr.C | SS330, SPHC, SPhD | S185 | 040A10, S185 | S185 | - |
| Q215A | Cr.58 | SPHC | - | 040A12 | - | - | |
| Q235A | Cr.D | SS400, SM400A | - | 080A15 | - | E235B | |
| Q235B | Cr.D | SS400, SM400A | S235JR G1, S235JR G2 | S235JR, S235JR G1, S235JR G2 | S235JR, S235JR G1, S235JR G2 | E235B | |
| Q255A | - | SS400, SM400A | - | - | - | - | |
| Q275 | - | SS490 | - | - | - | E275A | |
| High-Quality Carbon Structural Steel | 08F | 1008, 1010 | SPHD, SPHE | - | 040A10 | - | - |
| 10 | 1010 | S10C, S12C | CK10 | 040A12 | XC10 | C101 | |
| 15 | 1015 | S15C, S17C | CK15, Fe360B | 08M15 | XC12, Fe306B | C15E4 | |
| 20 | 1020 | S20C, S22C | C22 | IC22 | C22 | - | |
| 25 | 1025 | S25C, S28C | C25 | IC25 | C25 | C25E4 | |
| 40 | 1040 | S40C, S43C | C40 | IC40, 080M40 | C40 | C40E4 | |
| 45 | 1045 | S45C, S48C | C45 | IC45, 080A47 | C45 | C45E4 | |
| 50 | 1050 | S50C, S53C | C50 | IC50, 080M50 | C50 | C50E4 | |
| 15Mn | 1019 | - | - | 080A15 | - | - | |
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