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Alloy steel is steel alloyed with a variety of elements in total amounts of between 1.0% and 50% by weight to improve its mechanical properties. Alloy steels are broken down into two groups: low alloy steels and high alloy steels. The difference between the two is somewhat arbitrary: Smith and Hashemi define the difference at 4.0%, while Degarmo, et al., define it at 8.0 %.[1][2] Most commonly, the phrase "alloy steel" refers to "low alloy" steels.


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440B Stainless Steel

  • Numbers: 2011030802
  • Model: 440B
  • Producers: China
  • Update time: 2011.03.08
  • Browse:

Product Description:

Stainless steel

440B  high carbon chromium stainless steel

440B is a high carbon chromium stainless steel combining Stainless steel properties with excellent hardness after heat treatment. 440B can achieve a hardness of up to 58 Rockwell HRc. 440B has similar corrosion resistance properties to type 410 stainless, with optimum cossision resistance of 440B achieved with a temper below about 400°C. For 440B to achieve best corrosion resistance, surfaces must be free of scale, lubricants, foreign particles, and coatings applied for drawing and heading.  Due to its high carbon content 440B annealed stainless machines similar to a high speed steel annealed grade

Typical Analysis



To achieve full anealing of 440B heat uniformly to 850 to 875°C. Soak and cool very slowly in the furnace.
To heat treat 440B heat to 1010 to 1070°C, fully soak and quench in warm oil or cool in air. Be carefull not to overheat 440B or full hardness will not be obtained.
When tempering 440B a Rockwell hardness of 58/59HRc can be obtained. Temper for at least one hour.
Tempering °C



Mechanical Properties at Room Temperature
(440B hardened at 1040°C, oil quenched and tempered at 300°C)

 Tensile (UTS)

1930 N/mm²
 0.2% Yield Strength
1860 N/mm² Min
 Elongation (50.8mm)
3% min
 Reduction of Area


 Cr Alloy Martensitic Stainless steel Specifications 440B UNS S44003 AISI 440B SAE 51440B  ASTM A276 

 Special Steel classification:

Stainless steel,Hi-Steel HSLA-80,Steel mould,Heat resistant steel,Tool steel,Ball bearing steel,Spring steel,Alloy steel,Construction steel,Die steel,Mould steel.

Product description:

Step Shaft 440B Tube 440B Pie-shaped 440B Ring 440B Module 440B Large valves of the main 440B Other Profiled forgings 440B

Products Introduction  :

Specialized and high quality steel.

We have the advantages of equipment, technologies and price.


Round bar :
Diameter : 1mm-2000mm

Square bar:
Size: 50mm * 50mm-600mm *600mm

Plate steel/flat bar:
Size:Thickness:0.1mm-800mm Width:10mm to 1500mm

Size:OD:6-219mm  WT:1-35 mm.

Cold-rolled sheet:Thickness:2-5mm Width:1000mm Length:2000mm

Hot-rolled sheet:Thickness:6-80mm Width:210-610mm

Length: We can supply any length based on the customer's requirement.

Forging/hot rolling/ extrusion of steel.

Forging: Shafts with flanks/pipes/tubes/slugs/donuts/cubes/other shapes

Finished goods condition: hot forging/hot rolling + annealing/normalizing + tempering/quenching + tempering/any conditions based on the customer's requirement

Surface conditions: scaled (hot working finish)/ground/rough machining/fine machining/based on the customer's requirement

Furnaces for metallurgical processing: electrode arc + LF/VD/VOD/ESR/Vacuum consumable electrode.

Ultrasonic inspection: 100% ultrasonic inspection for any inperfections or based on the customer's requirement

Excellent service for all kinds of industries,with advantages of technologies, equipment and price.

We serve you with our honesty, integrity, and professionality.


Stainless Steel Suppliers | Hi-Steel HSLA-80 | Steel mould | Heat resistant steel | Tool Steel | Ball bearing steel | Spring steel | Alloy

Copyright 2003 - 2011 China longhai special steel Co., LTD is mainly engaged in all kinds of stainless steel 630 production, wholesale, retail enterprises

TEL:+86-15328239557 | FAX:+86-816-3639422 | | Add:119#,Jiangdong road, Sanhe Town,Jiangyou City, Sichuan Province, China | Zip:621701