AISI 1045 is a medium-carbon steel (~0.45% C) used for shafts, axles and worn parts. Its common equivalents are EN C45 (1.0503), JIS S45C and Chinese 45#. It is readily machined in normalized condition and responds well to quenching and tempering. Confirm exact chemistry, heat treatment and MTC with GNEE STEEL.
Products Description
AISI 1045 is a medium-carbon steel with about 0.45% carbon - the sweet spot where you get noticeably more strength and wear resistance than low-carbon mild steel (1018/1020) while still being machinable and heat-treatable without the cost and welding headaches of low-alloy grades like 4140. In plain terms, 1045 is the "general-purpose medium-carbon bar" buyers reach for when a part must bear load and resist wear: shafts, axles, bolts, connecting rods, pins, rolls, spindles and hydraulic clamps. It is not stainless and not high-strength alloy, but it is cheap, available and predictable once you control the heat treatment.
The global buyer's real question is equivalence - 1045 in the US system maps to C45 (EN 1.0503) in Europe, S45C in Japan and 45# in China, so cross-standard substitution is usually straightforward if chemistry and heat treatment are matched.
Specifications
| Item | Parameter | Value (or confirm with GNEE STEEL) |
| 1 | Grade (AISI/SAE) | 1045 medium-carbon steel |
| 2 | Equivalents | EN C45 / 1.0503; JIS S45C; GB 45#; BS 080M46; ISO C45E |
| 3 | Carbon (C) | ~0.43 – 0.50% (typical 1045) |
| 4 | Manganese (Mn) | ~0.60 – 0.90% |
| 5 | Silicon (Si) | ~0.15 – 0.35% |
| 6 | Phosphorus / Sulfur | ≤0.040% / ≤0.050% (typical) |
| 7 | Tensile (typical) | ~585 – 700 MPa (depends on condition) |
| 8 | Yield (typical) | ~310 – 450 MPa (depends on condition) |
| 9 | Hardness (typical) | ~170 – 210 HB as-rolled/normalized |
| 10 | Heat treatment | Normalize, anneal, quench & temper, stress relieve |
| 11 | Forms | Bar, rod, plate, flat; confirm sizes with GNEE STEEL |
| 12 | Applications | Shafts, axles, bolts, rods, clamps, pins, rolls, studs |
Procurement & Ordering
GNEE can supply 1045 / C45 / S45C in bar, plate and section forms; for an order, define the standard you need (AISI 1045, EN C45, JIS S45C or GB 45#), the form and size, and the heat-treated condition. Equivalent grades are usually interchangeable on chemistry, but tensile/hardness and tolerances differ by standard, so request MTC / EN 10204 3.1 and confirm the actual analysis rather than assuming. Mixed sizes can be consolidated in one container; packing is seaworthy export standard, typically from Tianjin or Qingdao.
MOQ and lead time are confirmed per size - common rounds and flats are usually in stock or short lead. Prices track carbon and alloy indices; confirm the valid quote window and Incoterm (FOB/CFR/CIF). Note: the source page also discussed SS416 (a martensitic stainless) - that is a different material and should not be confused with 1045; if you need stainless, specify it separately.
Buyer's Checklist
State the standard you need (AISI 1045, EN C45, JIS S45C or GB 45#) and the heat-treated condition (annealed, normalized or hardened-and-tempered) so the hardness and machinability match your shop. Request MTC / EN 10204 3.1 and verify chemistry, since equivalent grades differ slightly in tolerance. A common error is welding 1045 without preheat, causing hard-zone cracks - confirm procedure with GNEE STEEL. If you need higher strength, discuss 4140 rather than over-specifying 1045.
FAQ
Q: 1045 or 4140 - which should I use?
A: 1045 for general medium-strength, low-cost parts; 4140 (low-alloy) when you need higher strength, toughness and hardenability. Confirm the duty with GNEE STEEL.
Q: Is C45 the same as 1045?
A: Yes, C45 (EN 1.0503) is the European equivalent of AISI 1045; S45C (JIS) and 45# (GB) are also equivalents. Verify chemistry on the MTC.
Q: Can 1045 be welded?
A: Yes, but preheat and post-weld stress relief are recommended to avoid cracking; normalized condition welds more easily than hardened.
Q: What heat treatment do I need?
A: Normalize or anneal for machining; quench and temper for strength/wear. Tell GNEE STEEL the target hardness so the right condition ships.
Q: Do you provide MTC?
A: Yes, mill test certificate available; pre-shipment inspection can be arranged.
Q: Which port do you ship from?
A: Typically Tianjin or Qingdao in seaworthy packing; confirm FOB/CFR/CIF to your port.
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