GB/T 3077 20Cr Steel Plate
- Alloy or Not: Alloy
- Thickness: 6 – 150 mm, or as requested
- Width: 900 – 4800 mm, or as requested
- Length: 3000 – 25000 mm, or as requested
- Technique: Hot Rolled, Cold Rolled, Forged
- Condition: +A/+N/+QT/+HR/+CR, or as requested
- Processing Service: Machining (e.g. Turning, Milling), Cutting, Forging, Welding, etc.
- Certification: ISO 9001
- Inspection: SGS, TUV, Factory Inspection
- Origin: Hubei/Henan/Jiangsu, China
- Port: Qingdao, Tianjin, Lianyungang
- MOQ: 5 tons (or as per negotiation)
- Delivery Time: 8-14 Days
- Payment: T/T, L/C
Product Detail
20Cr steel plate is a reliable and versatile alloy carburizing steel with higher strength and hardenability than regular carbon steel. After heat treatment, such as normalizing or quenching and tempering, it offers balanced strength and toughness without temper brittleness tendencies. When carburized or carbonitrided, the surface becomes harder, with excellent wear resistance and some corrosion resistance. This makes it suitable for producing parts such as gears, shafts, cams, worm gears, and piston pins, particularly where both high surface hardness and core strength are required.
In its quenched and tempered condition, 20Cr steel handles medium-impact loads well. It also has good machinability and cold deformation plasticity, which allows for efficient cold drawing and other machining operations. Additionally, its weldability ensures it can be used across different applications. Due to these attributes, 20Cr steel is widely utilized in machinery manufacturing and automotive parts.
Contact us if you are unfamiliar with this product or have questions unsolved.
Naming Rules
Here’s a breakdown of 20Cr:
- “20” – Approximate 0.20% carbon.
- “Cr” – Chromium.
Features
20Cr steel plates could bring the following benefits to your project:
- High surface hardness – Chemically treated surfaces are wear-resistant and corrosion-resistant, extending part lifespan.
- High strength and toughness – Suitable for parts that endure moderate impact and load.
- Excellent hardenability – Balanced strength and toughness after heat treatment, no temper brittleness.
- Versatile applications – Ideal for manufacturing gears, cams, worms, and other complex or small-section wear-resistant parts.
- Good cold formability & machinability – Easy to process after cold drawing, high-temperature normalizing, or tempering.
- Good weldability – Enhances connectivity and flexibility during manufacturing.
Applications
Automotive
Gear shafts, drive axles, camshafts, transmission components, etc.
Aerospace
Landing gear components, engine parts, hydraulic systems, aircraft fittings, etc.
Construction
Heavy-duty fasteners, support beams, structural frames, reinforcing bars, etc.
Industrial Machinery
Gearboxes, conveyor systems, machine tools, shafts, couplings, etc.
Oil & Gas
Drill bits, valve bodies, pump components, pipeline fittings, etc.
Defense
Weapon barrels, armored vehicle parts, missile components, gear mechanisms, etc.
Product Parameters
| Parameter | Details |
|---|---|
| Standard | GB/T 3077, ASTM A29/A29M, EN 10083-1, JIS G4051, ISO 683-1, BS 970, GOST 4543, etc. |
| Grade | 20Cr, 5120, 20Cr4, 1.7027, SCr420, 20X |
| Thickness | As requested; 6 – 150 mm; Standard 5/6/8/10/12/14/16/20/25/30 mm |
| Width | As requested; 900 – 4800 mm; Standard 1000/1250/1500/1800/2000 mm |
| Length | As requested; 3000～25000 mm; Standard 2000/4000/6000/8000/12000 mm |
| Thickness Tolerance | ±1%; or as requested |
| Surface Treatment | Chrome-Plated, Nickel-Plated, Nitrided, Carburized, Black Oxide Coated, Phosphated, etc. |
| Condition of Delivery | +A/+N/+QT/+HR/+CR, or as requested |
| Testing Method | CCA, HB/HRC/HV, NDT, TST, ITT, etc. |
| Application | Gear shafts, camshafts, transmission components, machine tools, shafts, couplings, conveyor systems, pump components, valve bodies, structural frames, support beams, reinforcing bars, heavy-duty fasteners, pipeline fittings, drive axles, engine parts, etc. |
| Certification | Approved by ISO 9001 |
| Packaging | Standard seaworthy packing, or as requested |
*Condition of Delivery: A – Annealed, N – Normalized, QT – Quenched & Tempered, HR – Hot Rolled, CR – Cold Rolled
*Testing Method: CCA – Chemical Composition Analysis, HB/HRC/HV – Hardness Testing (Brinell, Rockwell, Vickers), NDT – Non-Destructive Testing, TST – Tensile Strength Testing, ITT – Impact Toughness Testing
Material Specifications
Chemical Composition
| Component | C | Si | Mn | P | S | Cr | Ni | Cu | Mo |
|---|---|---|---|---|---|---|---|---|---|
| Wt% | 0.18-0.24 | 0.17-0.37 | 0.50-0.80 | ≤0.035 | ≤0.035 | 0.70-1.00 | ≤0.30 | ≤0.30 | ≤0.15 |
*According to GB/T 3077-1999.
Mechanical Properties
| Thickness (mm) | Tensile Strength (σb, MPa) | Yield Point (σs, MPa) | Elongation (δ, %) | Reduction of Area (ψ, %) | Hardness (HBW) | Impact Absorbed Energy (KV2, J) |
|---|---|---|---|---|---|---|
| ≤80 | ≥835 | ≥540 | ≥10 | ≥40 | ≤179 | ≥47 |
| >80 – 100 | ≥835 | ≥540 | ≥9 | ≥35 | ≤179 | ≥44.65 |
| >100 – 150 | ≥835 | ≥540 | ≥8 | ≥30 | ≤179 | ≥42.3 |
| >150 – 250 | ≥835 | ≥540 | ≥7 | ≥25 | ≤179 | ≥39.95 |
*According to GB/T 3077-1999.
*Heat Treatment Temperature: Quenching ±15°C, low-temperature tempering ±20°C, high-temperature tempering ±50°C.
*Tensile Test: If no yield point is observed in the tensile test specimen, and the yield strength (σs) cannot be determined, measure specified residual elongation stress (στ0.2).
*Hardness: Values in the table refer to Brinell hardness (HB10/3000) in the annealed or high-temperature tempered state.
*Recommended Heat Treatment: First quenching at 880°C (water or oil cooling); re-quenching at 780-820°C (water or oil cooling); tempering at 200°C (water or air cooling).
Why Choose Us
Consistent Quality
We tackle your primary quality concerns with 20Cr steel — such as surface hardness, dimensional accuracy, surface defects, and decarburization — through strict heat treatment control systems, precision machining & advanced deformation prediction technology, protective oxidation-resistant surface treatments, and atmosphere-controlled processing, ensuring consistent performance, surface integrity, and durability.
Precise Dimensions
We guarantee the dimensional accuracy of our 20Cr plates in accordance with international standards. We can maintain tight tolerances up to ±0.01 mm through precision equipment and ISO 9001-certified processes. Every batch undergoes 100% inspection, with zero deviation complaints in the past 5 years. We ensure smooth project execution without installation delays.
Stable Supply
We have 3 self-operating factories with a combined annual capacity of over 500,000 tons. In the event of any unforeseen circumstances, we can coordinate across factories to ensure stable production and on-time delivery.
Stable & Competitive Pricing
We maintain upstream raw material suppliers with price-lock agreements in place to effectively manage material cost fluctuations. Also, considering that our clients may face pressure from market changes, we will try our best to offer reasonable discounts to both new and existing clients.
Secure Packaging & Shipping
Packaging can be customized according to your requirements. We provide transparent, real-time photos of the packaging and loading process for your verification. You can also choose your trusted freight forwarder for transportation to ensure the entire logistics process is secure and reliable.
About Us
Founded in 1999, SteelPRO Group operates three factories with a combined annual production capacity of over 500,000 tons. We specialize in manufacturing a wide range of steel products, including round steel, profiles, plates, and pipes. Our portfolio encompasses low-alloy structural steel, tool steel, special steel, and more.
With strict adherence to global standards such as GB, ASTM, DIN, EN, and JIS, we ensure high-quality products, including heat-treated, machined, and prestressed steel. Our solutions are trusted by customers in diverse industries, and we proudly export to different countries across Europe, North America, and Asia.
At SteelPRO, we are dedicated to delivering tailored steel solutions and growing alongside our dear clients.
Certification
FAQ
What are your prices?
Our prices are subject to change depending on supply and market conditions. For an accurate and up-to-date quote, please contact our sales team directly.
Can you provide relevant documentation?
Yes, we can provide a wide range of documentation, including Certificates of Analysis/Conformance, Insurance, Certificates of Origin, and any other required export documents.
What is the average lead time?
As per mass production, the lead time is 5-20 days after:
1) we have received your deposit; 2) we have received your final confirmation on your orders.
If our lead time doesn’t meet your deadlines, please contact our sales directly in advance in case of any potential issues. We will try to accommodate your needs in all cases, and we are able to do so in most cases.
Can you provide free samples?
Yes, we can provide free samples for quality evaluation. However, shipping costs are generally covered by your company.
Can I visit your factory?
Of course! You are welcome to visit our factory. Please contact us in advance to arrange a convenient time for your visit, and we will gladly organize a tour and provide any necessary information to ensure a productive visit.
Our Service
SteelPRO Group – manufacturer and solution provider for special steel, offering multi-industry application solutions and customised services, 100% quality free, accompanying customers in their growth!
Our Quality Control
- Roundness
- Tolerance
- Microstructure
- Non-Destructive Testing
- Destructive Testing
- Process Control
Service Integration Processing
- Welding
- Metal Fabrication
- CNC Machining
- Lathe
- Forming
