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round steel bar factory in China
1. Grade: 1045 1020 4140 4150 8620 4340
2. Hot rolled, black surface. Cold drawn, bright surface. Forged, black or black surface
3. diameter: 20-300mm
4. MOQ: 5mt
5. Chemical composition:
Grade | C | Si | Mn | P | S | Cr | Mo | Ni | Cu | B |
SAE 1020B | 0.18 0.23 | 0.15 0.35 | 0.30 0.60 | Max 0.030 | Max 0.050 | 0.0005 0.0035 | ||||
SAE 1045B | 0.43 0.50 | 0.15 0.35 | 0.60 0.90 | Max 0.030 | Max 0.050 | 0.0005 0.0035 | ||||
SAE 4140 | 0.38 0.43 | 0.15 0.35 | 0.75 1.00 | Max 0.030 | Max 0.040 | 0.80 1.10 | 0.15 0.25 | Max 0.25 | Max 0.35 | |
SAE 4150 | 0.48 0.53 | 0.15 0.35 | 0.75 1.00 | Max 0.030 | Max 0.040 | 0.80 1.10 | 0.15 0.25 | Max 0.25 | Max 0.35 | |
SAE 4320 | 0.17 0.22 | 0.15 0.35 | 0.45 0.65 | Max 0.030 | Max 0.040 | 0.40 0.60 | 0.20 0.30 | 1.65 2.00 | Max 0.35 | |
SAE 4340 | 0.38 0.43 | 0.15 0.35 | 0.60 0.80 | Max 0.030 | Max 0.040 | 0.70 0.90 | 0.20 0.30 | 1.65 2.00 | Max 0.35 | |
SAE 5140 | 0.38 0.43 | 0.15 0.35 | 0.70 0.90 | Max 0.030 | Max 0.040 | 0.70 0.90 | Max 0.06 | Max 0.25 | Max 0.35 | |
SAE 8620 | 0.18 0.23 | 0.15 0.35 | 0.70 0.90 | Max 0.030 | Max 0.040 | 0.40 0.60 | 0.15 0.25 | 0.40 0.70 | Max 0.35 |
6..Quality Contation
Both end of each bar must be cut.
Show heat No. on each bar
Surface condition the surface of the hot rolled square bar shall befree cracks, scar and wrinkles that affect the use of the billets.