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Help CenterCarbon Steel Bar 1045 40Cr 50mm-300mm Diameter Quenched and Tempered Hardness 28-32 HRC
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Welcome to Hemaokang Steel (Shandong) Co., Ltd. – your reliable partner for high-quality carbon steel bars. Established in 2025, we have rapidly grown into a global supplier with an annual export value of US$50 million – US$100 million. Our Carbon Steel Bar 1045 / 40Cr in diameters from 50mm to 300mm is quenched and tempered to achieve a consistent hardness of 28-32 HRC, ensuring excellent mechanical properties for demanding applications. With a team of 51-100 dedicated professionals and ISO9001 certification, we deliver precision-engineered steel bars that meet international standards.
Product Features & Technical Specifications
Our carbon steel bars are manufactured using advanced heat treatment processes to provide superior strength, wear resistance, and dimensional stability. The combination of 1045 medium carbon steel and 40Cr alloy steel offers flexibility for different applications – 1045 provides good machinability and weldability, while 40Cr offers enhanced hardenability and toughness after quenching and tempering.
- Quenched and Tempered (Q&T): Uniform hardness profile of 28-32 HRC throughout the bar cross-section, reducing internal stress and improving fatigue life.
- Diameter Range: Available from 50mm to 300mm, with customized lengths up to 12 meters or as per your requirements.
- High Strength & Toughness: Yield strength ≥ 600 MPa (for 40Cr) and tensile strength ≥ 800 MPa, ideal for heavy-duty components.
- Dimensional Accuracy: Strict tolerance control (e.g., h9 or better) ensures consistent performance in machining and assembly.
- Surface Options: Black (as-rolled), bright (peeled), or turned finish to suit different processing needs.
- Versatile Applications: Used in shafts, gears, bolts, connecting rods, axles, and other mechanical parts under moderate to high stress.
| Parameter | Specification |
|---|---|
| Material Grade | 1045 (C45) / 40Cr (AISI 5140 equivalent) |
| Diameter | 50mm – 300mm (other sizes available on request) |
| Hardness | 28 – 32 HRC (uniformly distributed) |
| Heat Treatment | Quenching + Tempering (Q&T) |
| Tensile Strength | ≥ 800 MPa (40Cr) / ≥ 600 MPa (1045) |
| Yield Strength | ≥ 600 MPa (40Cr) / ≥ 400 MPa (1045) |
| Elongation | ≥ 16% (40Cr) / ≥ 20% (1045) |
| Delivery Length | 3m – 12m (custom lengths available) |
Key Advantages for Your Business
- Consistent Quality: Each batch is tested for hardness, chemical composition, and mechanical properties, ensuring repeatable results for your production.
- Cost-Effective: Direct from manufacturer – no middlemen. Our annual export volume of over US$50 million allows competitive pricing without compromising quality.
- Flexible Customization: Need a specific diameter, length, or surface finish? We offer tailor-made solutions with short lead times.
- Global Logistics: Serving North America, Europe, Southeast Asia, Africa, Oceania, and more. We arrange safe packaging and on-time delivery.
- Technical Support: Our experienced engineers can advise on material selection and heat treatment to optimize your application.
At Hemaokang Steel, we understand that reliability is the foundation of your business. Our Carbon Steel Bar 1045 / 40Cr has been trusted by clients in heavy machinery, automotive, and construction industries for its stable performance and long service life. Whether you need standard sizes or custom specifications, we are committed to meeting your exact requirements.
Trust & Credibility
As a ISO9001:2015 certified supplier, we adhere to strict quality management systems. Our facility in Liaocheng, Shandong is equipped with modern testing equipment including spectrometers, hardness testers, and tensile testing machines. With a team of 51-100 skilled workers and an annual export value exceeding US$50 million, we have the capacity and expertise to fulfill large-volume orders efficiently. Our main markets span across North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, the Middle East, and Asia, reflecting the global trust in our products.
Choose Hemaokang Steel for your next project. Contact us today to discuss your requirements, request a quote, or order samples. We look forward to building a long-term partnership with you.
Frequently Asked Questions (FAQ)
Q1: What is the difference between 1045 and 40Cr carbon steel bars?
1045 is a medium carbon steel with good weldability and machinability, suitable for general engineering parts. 40Cr is an alloy steel with higher hardenability and strength after heat treatment, ideal for components requiring higher toughness, such as shafts and gears.
Q2: Can you supply bars with a specific hardness outside 28-32 HRC?
Yes, we can adjust the tempering temperature to achieve different hardness ranges (e.g., 20-25 HRC or 35-40 HRC) upon request. Please provide your target hardness and application details.
Q3: What tolerances can you guarantee on diameter?
Standard tolerance is h9 (e.g., for 100mm bar, tolerance is +0/-0.087mm). Tighter tolerances like h7 or h8 are available as custom options.
Q4: Do you offer cutting services for specific lengths?
Absolutely. We can cut bars to your desired length (e.g., 1m, 2m, 6m). Please specify the length and quantity when ordering.
Q5: What surface finishes are available?
We provide black (as-rolled), bright (peeled or turned), and ground finishes. Bright bars have better dimensional accuracy and surface quality for direct machining.
Q6: How do you ensure the hardness is uniform across the bar?
Our quenching and tempering process is carefully controlled with uniform heating and cooling. We perform hardness tests at multiple points (center, surface, and along the length) to ensure consistency.
Q7: What is the minimum order quantity (MOQ)?
MOQ is typically 5 tons per size, but we can accommodate smaller trial orders for new customers. Please contact our sales team for details.
Q8: How long does delivery usually take?
For standard sizes, delivery is 15-25 days after order confirmation. Custom sizes may require 25-40 days. We ship via sea, rail, or air based on your location and urgency.
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