Sichuan Liaofu Special Steel Company is one of the most experienced manufacturers and suppliers of 45crnimo1v steel in China. With over 20 years' experience, our factory offer high quality products made in China with competitive price. Welcome to contact us for wholesale service.
45CrNiMo1V Alloy Steel Round Bar
45CrNiMo1V is a medium-carbon alloy structural steel containing chromium, nickel, molybdenum, and vanadium. The addition of vanadium refines the grain structure and enhances toughness following quenching and tempering, making the steel suitable for manufacturing heavy-duty gears, shafts, connecting rods, and high-strength fasteners. This material originates from Baosteel, a renowned domestic manufacturer, and is supplied as hot-rolled, black-surface bars with a diameter of 80 mm. The original mill certificates confirm consistent chemical composition and impact toughness, and the heat number is fully traceable to the original producer. This stock of 45CrNiMo1V steel is stored in our Chengdu warehouse and can be cut to your specified lengths.
Chemical Composition (wt%, actual values from mill certificate)
| Element | Heat 1 | Heat 2 |
|---|---|---|
| C | 0.42 | 0.44 |
| Si | 0.27 | 0.29 |
| Mn | 0.92 | 0.94 |
| P | 0.006 | 0.006 |
| S | 0.001 | 0.001 |
| Cr | 1.08 | 1.10 |
| Ni | 1.75 | 1.78 |
| Mo | 0.24 | 0.25 |
| Cu | 0.09 | 0.10 |
| V | 0.05 | 0.06 |
| Al | 0.025 | 0.028 |
The standard range for 45CrNiMo1V under Baosteel specification BJTG07-009 is available on request. The values above are from the actual heat and show tight control on phosphorus and sulfur.
Mechanical Properties (as supplied, hot rolled)
| Property | Value |
|---|---|
| Hardness | 298–301 HB |
| Impact toughness | 54–55 J (longitudinal, room temperature) |
| Condition | Hot rolled, black surface |
Tensile strength and yield strength depend on the quenching and tempering processes. If you have specific mechanical property requirements following heat treatment, we can arrange third-party testing or provide reference data from the steel mill. The impact values mentioned above are derived from the mill's original test certificates and apply to the specific heat lot you receive.
Reference Heat Treatment Process
For 45CrNiMo1V, the standard austenitizing temperature is 850–880°C, followed by oil quenching; tempering is typically performed between 580°C and 650°C to balance strength and toughness. The specific process depends on the target hardness and the cross-sectional dimensions of the workpiece. Under appropriate quenching conditions, an 80 mm diameter bar can achieve through-hardening across its entire cross-section. We can provide Baosteel's recommended heat treatment specifications if a reference process is required.
Applications
Heavy-duty gears and pinions
Machinery shafts and rotors
Connecting rods and high-strength bolts
Mold bases and support plates
Automotive and wind power components
Heavy-duty transmission spindles for mining and metallurgical
How To Cooperate With Us?
We are a trading company specializing in specialty steels and maintain ready stock from Baosteel. We can accommodate orders ranging from a single cut-to-size piece for sampling to the purchase of entire stock lots for production needs. We provide mill test certificates directly, ensuring you receive accurate heat numbers and original test data rather than generic copies. Please let us know if you require 45CrNiMo1V steel bars in specific specifications or heat-treatment conditions, and we will provide you with a prompt quotation.
Our address
Room 1010, Liangli Steel Trading Mansion C, No. 6, Jinfeng Road, Jinniu District, Chengdu, Sichuan, China
Phone Number
+8615882242915
lftg@lfspecialsteel.com
FAQ
Q: What is the difference between 45CrNiMo1V and 40CrNiMoA, and can I substitute one for the other?
A: 45CrNiMo1V has vanadium, which refines the grain and gives better toughness at the same strength level. 40CrNiMoA does not. For heavy gears or shafts that see shock loading, 45CrNiMo1V is the safer choice. For general parts, 40CrNiMoA may work if your design allows. Always check the hardenability and core properties for your section size. We can supply both, but the final decision should come from your engineer.
Q: Are you a Baosteel agent or a trader, and can you guarantee the certificate matches the heat?
A: We are a trader, not a mill agent. We buy from Baosteel or their authorized channels and keep the original certificate with the heat number. The certificate you receive matches the bar you receive. You can verify the heat number with Baosteel if you want. We do not alter certificates or mix heats.
Q: How much of the Φ80 mm stock do you have, and can you cut a short piece for a trial?
A: Current stock is 3 pieces, about 4655 kg total. We can cut a short length for a trial - you do not need to buy the whole lot. Tell us the length and quantity, and we will quote the smallest practical piece. The same mill certificate and heat number apply to the cut piece.
Q: What heat treatment do you recommend for 45CrNiMo1V?
A: Austenitize at 850–880°C, oil quench, then temper at 580–650°C depending on the hardness you need. For Φ80 mm, oil quenching gives through-hardening if you control the agitation. If you need a specific hardness range, tell us and we can share reference data from the mill. We do not perform heat treatment ourselves, but we can help you review the cycle.
Q: Is the impact toughness of 54 J typical, or does it vary by heat?
A: The 54–55 J values come from the actual mill certificate for this heat. They are longitudinal, room temperature. Different heats can vary slightly, but Baosteel controls the chemistry tightly, especially phosphorus and sulfur. If you need guaranteed impact values for a specific heat, we can arrange third-party testing before shipment.
Q: Can you provide EN 10204 3.1 or third-party inspection for export?
A: Yes. We can arrange SGS or BV inspection and provide an EN 10204 3.1 certificate if your customer requires it. We also handle export packing and documents for Europe, Southeast Asia, and the Middle East. Tell us the destination and required documents, and we will confirm the lead time and cost.
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