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E: enquiry@qilumetal.com
E: enquiry@qilumetal.com
No. 18 Xiangfu Middle Road,Yuhua District, Changsha City
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Grade: AISI 1050
Equivalent Steel: GB 50#, JIS S50C, EN C40/1.0540, BS 080M50
AISI 1050 steel is a medium carbon steel whose chemistry is built around a carbon range of 0.48–0.55%, the element that drives its strength and hardness after heat treatment. Manganese is held between 0.60% and 0.90% to improve hardenability and deoxidation. Phosphorus and sulfur are kept low, each capped at 0.040% and 0.050% respectively, to protect ductility, toughness, and machinability. The remainder is iron, with only trace residuals of copper, nickel, and chromium. This balanced chemistry gives 1050 steel its reliable response to quenching and tempering, making it a dependable choice for shafts, gears, and wear-resistant components.
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1050
Qilu
AISI 1050 steel is a medium-carbon steel grade widely used for components that require a practical balance of strength, hardness, wear resistance, and machinability. Also commonly identified as SAE 1050 steel or 1050 carbon steel, this grade contains approximately 0.50% carbon, providing higher hardness and strength than low-carbon grades such as AISI 1018 and AISI 1020.
1050 steel is suitable for applications where moderate to high mechanical strength is required without moving to more highly alloyed steels. It can be supplied in various forms, including 1050 steel round bar, flat bar, square bar, steel plate, and custom-machined components, depending on project requirements.
Qilu Steel can supply AISI 1050 steel in different sizes, surface conditions, and delivery conditions for industrial manufacturing and engineering applications.
Country | USA | Europe | China | Japan | British |
Standard | ASTM A29 | EN10250-2 | GB/T699 | JIS G4051 | BS970 |
Grade | 1050 | C50/1.0540 | 50# | S50C | 080M50 |
Grade | C | Si | Mn | P | S | Cr | Mo | Ni |
1050 | 0.48-0.55 | / | 0.60-0.90 | 0.040Max | 0.050Max | / | / | / |
C50/1.0540 | 0.47-0.55 | 0.40Max | 0.60-0.90 | 0.045Max | 0.045Max | 0.40Max | 0.10Max | 0.40Max |
50# | 0.47-0.55 | 0.17-0.37 | 0.50-0.80 | 0.035Max | 0.035Max | 0.25Max | / | 0.30Max |
| S50C | 0.47-0.53 | 0.15-0.35 | 0.60-0.90 | 0.030Max | 0.035Max | / | / | / |
| 080M50 | 0.45-0.55 | 0.10-0.40 | 0.60-1.00 | 0.050Max | 0.050Max | / | / | / |
Mechanical properties for C50 open die forgings steel in the normalized and normalized and tempered conditions according to EN10250-2.
Size range | Tensile strength | Yield strength | Alongation | Impact value at RT/J | ||
L | Tr | L | Tr | |||
d≤100 | 610Mpa Min | 320Mpa Min | 14% Min | / | / | / |
100＜d≤250 | 590Mpa Min | 290Mpa Min | 14% Min | / | / | / |
Remark: L= Longitudinal Tr = Transverse
1050 steel exhibits adjustable mechanical properties under different heat treatment states, adapting to diverse industrial usage scenarios:
Tensile Strength: 690–790 MPa (annealed); 790–1000 MPa (heat-treated)
Yield Strength: ≥390 MPa (annealed); ≥585 MPa (quenched & tempered)
Elongation: ≥15%
Hardness: 197–248 BHN (annealed); up to HRC 58–59 (quenched)
Excellent deformation resistance, strong load-bearing capacity and long-term structural stability
Product type | Size range | Length |
Cold drawn bar | Φ3-Φ80mm | 6000-9000mm |
Hot rolled bar | Φ16-Φ310mm | 6000-9000mm |
Hot forged bar | Φ100-Φ1200mm | 3000-5800mm |
Hot rolled plate/sheet | T:3-200mm; W:1500-2500mm | 2000-5800mm |
Hot Forged block | T: 80-800mm; W: 100-2500mm | 2000-5800mm |
Surface Finish | Turned | Milled | Grinding(Best) | Polished(Best) | Peeled(Best) | Black Forged | Black Rolled |
Tolerance | +0/+3mm | +0/+3mm | +0/+0.05mm | +0/+0.05mm | +0/+0.1mm | +0/+5mm | +0/+1mm |
Straighness | 1mm/1000mm max. | 3mm/1000mm max. | |||||
Hunan Qilu Steel provides AISI 1050 steel in multiple forms (cold drawn bar, hot rolled bar, hot forged bar, hot rolled plate) to meet the processing needs of different industries, with strict control of straightness and dimensional tolerance to ensure assembly precision. Stock sizes are updated daily, with monthly stock of hot rolled/forged bars exceeding 10,000 tons.
| Process | Temperature | Cooling |
| Normalizing | 830-870°C | Air |
| Annealing | 680 – 710°C | Furnace |
| Quenching | 810-850°C | Water or oil |
| Tempering | 550-660°C | Air |
AISI 1050 can be machined effectively when supplied in a suitable hardness condition. Annealed or normalized material is generally easier to machine than quenched and tempered material with high hardness.
For CNC machining, turning, milling, drilling, and other operations, cutting parameters should be adjusted according to material hardness, tool material, workpiece dimensions, and required surface finish.
Because AISI 1050 has a relatively high carbon content, welding requires more attention than low-carbon steel grades. Rapid cooling can increase the risk of hard and brittle zones in the heat-affected area.
For welding applications, proper preheating, controlled interpass temperature, suitable welding consumables, and post-weld heat treatment may be required depending on section thickness and service requirements. A welding procedure should be qualified for critical components.
1050 carbon steel is extensively applied in industries requiring medium-to-high strength and wear resistance:
Mechanical manufacturing: Gears, shafts, spindles, bushings, structural fasteners
Automotive industry: Auto structural parts, suspension components, wear-resistant accessories
Agricultural machinery: Harvesting blades, tillage parts, heavy-load mechanical components
Construction & engineering: High-strength structural fittings, tool steel accessories
General industrial equipment: Wear-resistant plates, machine tool parts, forging components
AISI 1050 contains more carbon than AISI 1045, which generally gives it a higher hardness and strength potential after appropriate heat treatment. AISI 1045 is often selected when easier machining and a balanced combination of strength and ductility are priorities, while 1050 may be preferred when greater hardness and wear resistance are required.
AISI 4140 is a chromium-molybdenum alloy steel with substantially greater alloying content and hardenability than AISI 1050. For large-section components or applications requiring high strength and deeper hardening, 4140 may provide advantages.
1050 steel can be a more economical choice when the required performance can be achieved with a medium-carbon steel and appropriate heat treatment.
A1: Generally, 1050 has a higher carbon content and therefore offers greater hardness and strength potential than 1045, particularly after suitable heat treatment. Actual properties depend on the material condition and processing route.
A2: Yes, AISI 1050 carbon steel has excellent heat-treatable performance. It can be hardened via quenching and further tempered to improve toughness. After heat treatment, 1050 steel achieves high surface hardness and strong anti-wear properties, which greatly improves its service life under friction and heavy-load working conditions.
A3: 1050 steel features stable mechanical performance, good machinability, high wear resistance and balanced toughness. It provides higher tensile strength and hardness than low-carbon steel while maintaining better processability than high-carbon steel. It also shows good forging, cutting and shaping performance for secondary processing.
A4: We provide full-range 1050 steel products, including 1050 steel plates, steel sheets, round bars, square bars and flat bars. Custom size cutting, surface grinding, polishing and professional heat treatment services are available to meet customized industrial requirements.
Need 1050 steel for your next project? Reach out for grade confirmation, heat treatment advice, and supply options.
