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Quick Details

  • Grade: 400 Series
  • Standard: AISI, DIN, EN, GB, JIS
  • Length: customize
  • Thickness: 3mm--16mm
  • Width: below 350mm
  • Place of Origin: Jiangsu, China (Mainland)
  • Brand Name: changjiang
  • Model Number: GB8Cr17 / EN 1.4112 / AISI 440B /JIS SUS440B
  • Type: Plate
  • Application: knives, bearings, surgical tools and cutlery.
  • Certification: SGS
  • techique: hot rolled
  • surface: blacken or hot rolled, pickled, shot blasted

Packaging & Delivery

Packaging Details Seaworthy packing
Delivery Time 15-45 workings days after receipt the 30% advanced payment

440B Stainless Steel

 

440B stainless steel stockholders and suppliers, with more than 30 years experience. Ahonest stainless steel Co.,ltd are suppliers of 440B stainless steel plate , strips and coils.. A high carbon high chromium type combining stainless steel properties with excellent hardness after heat treatment. 440B is very similar to the 440C grade but with a slightly lower carbon content, it attains a lower hardness than 440C but has slightly better corrosion properties. Its corrosion resistance properties are similar to 410 stainless steel, with optimum corrosion resistance of 440B achieved with a temper below 400°C. For 440B to achieve best corrosion resistance all surfaces must be free of scale, foreign particles, lubricants and coatings applied for drawing and heading. With its high carbon content 440B stainless steel annealed bar has similar machining characteristics to a high speed steel annealed grade.

 

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Analysis
Carbon0.75-0.95%Chromium16.00-18.00%
Manganese1.00% maxSulphur0.030% max
Silicon1.00% maxPhosphorous0.040% max
Molybdenum0.75% max

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Applications

Suitable for applications requiring a combination of excellent wear resistance with moderate corrosion resistance. 440B stainless steel is commonly used in the oil, gas, marine, food and medical industries. Typical applications include valve components, knives, bearings, surgical tools and cutlery.

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Forging

Heat slowly and uniformly to 1180°C, allowing sufficient time for the steel to become heated through. Be careful not to overheat as this can cause a loss of toughness and ductility. Do not forge below 1010°C reheating if necessary. After forging cool slowly in furnace or thermoinsulating material, then anneal immediately. Air cooling after forging 440B may cause cracking.

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Annealing

Heat uniformly to 840-875°C. Soak and cool very slowly in the furnace.

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Hardening

Heat the 440B to 1010-1070°C, fully soak and quench in warm oil or air cool. Be careful not to overheat or full hardness will not be obtained.

 

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Tempering

When tempering 440B a Rockwell hardness of 58 HRc can be obtained. Temper for at least one hour. Tempering above 400°C is not recommended as this can cause a reduction in corrosion resistance and impact properties.
 

Temperature [°C]150200250300350
Hardness [HRc]5856545354

 

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Heat Treatment

Heat treatment temperatures, including rate of heating, cooling and soaking times will vary due to factors such as the shape and size of each component. Other considerations during the heat treatment process include the type of furnace, quenching medium and work piece transfer facilities. Please consult your heat treatment provider for full guidance on heat treatment of 440B stainless steel.

 

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