4140 Alloy Steel Plate Supplier: Otai is No.1 in China

1. What is 4140 Alloy Steel Plate?

4140 alloy steel plate is a medium-carbon steel that includes chromium and molybdenum. The 4140 alloy steel plate is known for its great strength, hardness, and toughness. It’s used in a lot of industries like machinery manufacturing, automotive, and mechanical parts etc. With the right heat treatment, 4140 steel plate can get excellent mechanical properties and hardness with range 28-32HRC. The heat treated 4140 alloy plate is a top choice for many industrial applications.

Look for 4140 Alloy Steel Plate supplier, Otai is number one in China with over 10000 tons 4140 steel plate in stock. Get Better Quotation today.

Standard and Related Standards

Country	USA	German	British	Japan	China	Australia
Standard	ASTM A29	DIN 17200	BS 970	JIS G4105	GB/T 3077	AS 1444
Grades	4140	1.7225/ 42CrMo4	42CrMo4	SCM440	42CrMo	4140

Chemical Composition & Equivalents

Standard	Grade	C	Mn	P	S	Si	Cr	Mo
ASTM A29	4140	0.38-0.43	0.75-1.00	0.035	0.040	0.15-0.35	0.8-1.10	0.15-0.25
EN 10083/EN 10250	42CrMo4/1.7225	0.38-0.45	0.6-0.9	0.035	0.035	0.4	0.9-1.2	0.15-0.30
JIS G4105	SCM440	0.38-0.43	0.60-0.85	0.03	0.03	0.15-0.35	0.9-1.2	0.15-0.30

2. What Should You Look for in a 4140 Alloy Steel Plate Supplier?

Finding the right 4140 steel plate supplier is super important. It not only affects the quality of the materials but also impacts your whole production process. Here are some key things to consider when choosing a supplier:

Consistent Material Quality

Make sure the steel plates have consistent quality and go through strict quality control and inspections. It’s important to have the heat number for all kinds of steel materials. Each heat number means the same batch of steel production. The quality of 4140 steel plate with same heat number will be much consistent and stable.

Cost-Effectiveness

Check if the supplier offers competitive prices and factory-direct quotes to help lower your purchase costs. Like Otai, we maintain the 4140 alloy plate materials for both preharden and as rolled condition. We deliver directly from the warehouse to you, and there is no middle man. Price is very attractive here. You can try to send one sample inquiry.

Stable Supply Chain

See if the supplier can provide a steady supply of materials, especially for urgent orders, and if they have enough stock. All 4140 high tensile alloy plates are from the top mills in China. Quality is reliable at those mills, and they are fully running all the time to ensur the stable supply every month.

At our side, we have our advanced ERP to keep our stock running and all sizes are available in stock, to deliver to you in time.

Good Processing Performance

Ensure the steel plates have good processing performance and can be provided in different conditions (like hot rolled, annealed, quenched, and tempered). Either QT 4140 plate or as rolled / hot rolled, and annealed 4140 steel plate are available.

You could choose from our stock list 4140 alloy steel plate easily.

Quality Guarantee

Look for a supplier that offers thorough quality checks, such as ultrasonic testing and chemical composition analysis, to guarantee the quality of the materials.

3. Otai: Your Quality 4140 Alloy Steel Plate Supplier

Large Inventory and Fast Delivery

Otai Special Steel always has around 10,000 tons of 4140 steel plates in stock, with thicknesses ranging from 6mm to 300mm. We can quickly respond to customer needs. For urgent orders, we can prepare and ship 4140 plate materials in the shortest time possible to keep your production on track.

Strict Quality Control

All our 4140 alloy steel plates go through strict quality control and meet ISO 9001 standards.

All 4140 alloy steel plates are from top mills in China, plus, we also do all necessary quality checking, such as checmical composition, ultrasonic test, hardness etc, to ensure the best quality to you.

Besides, test certificate will be sent to you together with shipment.

Different Conditions Available

Whether you need hot rolled, annealed, or quenched and tempered (Q&T) 4140 steel plates, we can supply them. We can also arrange further heat treatment to meet specific performance requirements.

Competitive Pricing

As a factory-direct supplier, we offer the most competitive prices to help you lower your purchase costs. We also provide flexible cutting services to customize sizes according to your needs, reducing material waste and increasing efficiency.

Excellent Customer Service

We offer not only high-quality products but also full technical support and after-sales service. Our professional team is always ready to help you with any issues in selection, processing, or use.