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440B 1.4112 X90CrMoV18 UNS S44003 Martensitic Stainless Steel Round Bar

Group Stainless Steel Bars
Min. Order 1 ton
Terms of Payment L/C, D/A, T/T
Update Time 2020-06-01
Item specifics
Diameter10-300mm
Surface conditionBlack, Blasted,
Delivery ConditionAnnealed, Hot rolled+annealed, Cold drawn only

Introduction

440B stainless steel is a high carbon martensitic stainless steel containing good strength, moderate corrosion resistance and ability to obtain and maintain wear resistance and excellent resistance.

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.

Standard
Chamical Component

Steel Grade

C

Si

Mn

P

S

Cr

Mo

440B

0.75-0.95

1.0 max

1.0 max

0.040 max

0.030 max

16.0-18.0

0.75 max

Size and Delivery Condition
Supply Diameter Range :
Diameter : 10-300 mm ; Length Max 9 meters.

Delivery Condition : 
Optional Process : Hot Rolled ; Cold Drawn 
Delivery Condition : Annealed
Surface : Bright ; Ground 

Heat Treatment

Annealing:

440B stainless steel is annealed at 843-871°C (1550-1600°F) and then cooled very slowly in a furnace. Hardening:

440B stainless steel is heated at 760°C (1400°F), soaked at 1010°C (1850°F) and finally cooled in oil or air. Tempering:

440B stainless steel is tempered at 148°C (300°F) to obtain maximum properties and the maximum hardness that can be obtained is RC58.

Property
Welding:
Welding is not generally recommended for grade 440B stainless steel as it tends to harden in air. If this steel grade is welded the recommended temperature is 260°C (500°F) and for the post weld treatment the recommended temperature is 732-760°C (1350-1400°F). The post weld treatment should take place for 6 h and then the material should be cooled slowly in a furnace to avoid cracking. Similar high heat inputs and filler metal should be used during operations. Machinability:
440B stainless steel is best machined in the annealed condition. Chip breakers are used to handle tough, stringy chips of grade 440B stainless steel. Ceramic or carbide tooling is best suited for this grade 440B stainless steel.