440B

Stainless Steel Square Bar-440B

Stainless Steel Square Bar-440B

According to the production process, stainless steel rods can be divided into three types: hot rolling, forging and cold drawing. The specification of hot rolled stainless steel round bar is 5.5-250 mm. Among them: 5.5-25mm small stainless steel round bars are mostly supplied in bundles of straight strips, which are often used as steel bars, bolts and various mechanical parts; stainless steel round bars larger than 25mm are mainly used for the manufacture of mechanical parts or as seamless steel pipe billets .

440B stainless steel has higher hardness than SUS440A steel and higher toughness than SUS440C steel. SUS440B is used for cutting tools, measuring tools and bearings.
High hardness and good wear resistance, when grinding, its disadvantage is that the viscosity is relatively large,
And it heats up quickly, but it's easier to grind than any carbon steel, and it's much easier to cut stock with a hand saw.
AISI 440B stainless steel properties:
1. Higher strength
2. Higher hardness
3. Ultra-high toughness
4. Excellent wear resistance
5. Excellent tempering resistance
6. Excellent corrosion resistance
7. Good high temperature dimensional stability

Equivalent Material of Stainless Steel  square bar

Grade UNS No. Old British Euronorm China GB Japanese JIS
BS EN No. Name
440B S44003  -  - 1.4112 X90CrMoV18 Cr12mov SUS 440B

Standard Specification Of 440B square bar

Specifications ASTM A276
Diameter 3、5、6、7、8、9、10、12、15、18、20、25、30、35、40、50、100、200etc
Length 2000mm, 2500mm, 3000mm,3500mm, 4000mm 5000mm 6000mm 10000mm 12000mm etc
Surface Black 、 bright、 pickling 、etc
Finish Hot rolled plate (HR), Cold rolled sheet (CR), 
Form Rod, Round, Channel Bar, Rings, Round Rod, Triangle, Hollow, Rectangle, T-Bar, Flat Bar, Precision Ground Bar, Blocks, Square, Threaded, Hex (A/F), Profiles, Half Round Bar, Ingot, Billet, I/H Bar, Forging etc.

Stainless steel composition content.

Grade C Mn Si P S Cr Mo Ni N
440B Min. 0.75 / / / / 16 / / /
Max. 0.95 1 1 0.04 0.03 18
Grade Tensile Strength
(MPa) 
Yield Strength
0.2% Proof (MPa) 
Elongation
(% in 50mm)
Hardness
Rockwell B(HR B) Brinell(HB)
440B 635 440 20 220

440B Characteristic machining technology

1D -- The surface has discontinuous granular shape, also known as fog surface.
Processing technology: hot rolling + annealing shot peening pickling + cold rolling + annealing pickling.
2D - A slightly silvery white colour.
Processing technology: hot rolling + annealing shot peening pickling + cold rolling + annealing pickling.
2B -- Silver white with better gloss and flatness than a 2D surface.
Processing technology: hot rolling + annealing shot peening pickling + cold rolling + annealing pickling + quenching and tempering rolling.
Ba - Excellent surface gloss, high reflectivity, like a mirror surface.
Processing technology: hot rolling + annealing shot peening pickling + cold rolling + annealing pickling + surface polishing + quenching and tempering rolling.
No.3 -- Good gloss, coarse grain surface.
Processing technology: polishing and tempering rolling for 2D or 2B with 100~120 abrasive materials (JIS R6002).
No.4 -- Good gloss, fine lines on the surface.
Processing process: polishing and tempering rolling for 2D or 2B with 150~180 abrasive materials (JIS R6002).
HL -- Silver grey with hair streaks.
Processing technology: 2D products or 2B products with appropriate granularity of abrasive materials for polishing the surface is a continuous abrasive grain.
MIRRO -- Specular.
Processing technology: 2D products or 2B products with appropriate granularity of the grinding material grinding and polishing to the mirror effect.

Stainless Steel square bar Price List

440B Stainless Steel square bar Price List 440B Stainless Steel square bar FOB Shanghai Per Unit (USD)
440B stainless steel black square bar $1550.00-$2050.00
440B stainless steel bright square bar $1850.00-$2350.00
440B  stainless steel pickling square bar $1550.00-$2050.00

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