403 Stainless Steel Plate
403 stainless steel is a type of martensitic stainless steel. Its most important characteristics are high strength and hardness, but its corrosion resistance is relatively average.
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Product Introduction

403 Stainless Steel Plate is a martensitic chromium stainless steel, widely recognized as a "turbine quality" grade due to its specialized use in high-speed, high-stress environments. It is very similar to the well-known 410 stainless steel but with slightly lower silicon and chromium content, which provides a favorable balance of strength, toughness, and moderate corrosion resistance that is crucial for demanding mechanical components.

As a martensitic steel, it is magnetic and can be hardened by heat treatment. This allows its mechanical properties to be precisely tailored for specific applications. The alloy is particularly valued for its good machinability, mechanical strength, and resistance to impact, making it the material of choice for critical parts in power generation and aerospace where reliability under

Product parameters


Item / ParameterSpecification for 403 (UNS S40300)Notes / Significance
Key Feature"Turbine Quality" Martensitic Steel. Excellent combination of strength, toughness, and machinability for high-stress parts.Primary reason to choose 403 for turbine blades, compressor parts, and high-integrity fasteners.
Common DesignationsUNS S40300, AISI 403, DIN 1.4000, SUS 403, GB 1Cr12Key for global specification. Indicates compliance with ASTM A240 for plate/sheet.
Chemical Composition (Typical wt.%)C: 0.10 - 0.15Cr: 11.50 - 13.00Mn: ≤ 1.00
Si: ≤ 0.50Ni: ≤ 0.75
Controlled carbon for hardenability; chromium provides corrosion resistance; low silicon distinguishes it from 410.
Mechanical Properties (Annealed Plate)Tensile Strength (Rm): ≥ 485 MPa (70 ksi)Yield Strength (Rp0.2): ≥ 310 MPa (45 ksi)Elongation (A): ≥ 20 - 25%Hardness (HB): ≤ 223Good base strength and ductility in annealed condition for fabrication. Can be significantly strengthened via heat treatment.
Physical PropertiesDensity: 7.80 g/cm³Modulus of Elasticity: 190 - 210 GPaStandard for martensitic steels.
Key Standards (Plate/Sheet)ASTM A240/A240M (Pressure Vessel & General Application)ASTM A276 (Bars and Shapes)ASTM A240 is the primary international procurement standard for plate.

Surface selection

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Packaging and transportation

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FACTORY SHOW

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FAQ

Q:What about your price? 
A:Our price is very competitive because we are a factory. Feel free to contact us if you are interested in our products. 

Q:Can I go to your factory to visit?
A:Of course, we welcome customers from all over the world to visit our factory.

Q:What product information do I need to provide?
A:You need to provide the grade, width, thickness, coating and the number of tons you need to purchase. 

Q:Does the product have quality inspection before loading? 
A:Of course, all our products are strictly tested for quality before packaging, and unqualified products will be destroyed.we
accept the third party inspection absolutely. 

Q:How about the delivery time? 
A:Within 3-15 days after we confirm you requirement. 

Q:What is your terms of payment ?
A:T/T, L/C at sight, Cash, Western Union are all accepted if you have other payment,please contact me. 

Q: Do you provide samples? 
A:Yes,we could offer the sample for you to test but please pay freight fee.

Q:How do we trust your company? 
A:We are a specialized company focusing on global steel trading and supply chain services. Our mission is to provide high-quality, multi-specification, and one-stop steel products and solutions to customers worldwide.

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