420/430/440C Stainless Steel Bar
420/430/440C Stainless Steel Bar
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420/430/440C Stainless Steel Bar
Alloy 420 is a martensitic stainless steel of the 12% Chromium type. Due to it's Chromium content 420 will achieve high hardness. Alloy 420 is used in many different applications including surgical and dental instruments, scissors, needle valves, gears, ball bearings, magnets etc. Alloy 420 should not be used for springs or heavily stressed parts that require to be operated at sub-zero temperatures.

Grade 430, also known as type WL 1.4016 stainless steel combines good corrosion resistance with good formability and ductility. As Grade 430 has excellent resistance to nitric attack it is well suited to use in chemical applications. Grade 430 is generally used for domestic appliances, flue linings, scientific apparatus etc.

Grade 440C stainless steel is a high carbon martensitic stainless steel. With high strength, moderate corrosion resistance, and good hardness and wear resistance.
Grade 440C is capable of attaining, after heat treatment, the highest strength, hardness and wear resistance of all the stainless alloys. Its very high carbon content is responsible for these characteristics, which make 440C particularly suited to such applications as ball bearings and valve parts.
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Chemical Composition:


Chemical Composition Limits

Weight%

C

P

Si

Fe

Mn

S

Cr

Alloy 420

0.15 min

0.040 max

1.00 max

Bal

1.00 max

0.030 max

12-14

Typical Mechanical Properties:


Material

Tensile Strength (Mpa)

Proof Stress 0.2% (MPa)

% Elongation in 2"

% Reduction of Area

Hardness Brinell

Alloy 420 Ann
Room Temp 1" Round Bar

655

345

25

55

196


Chemical Composition:


Chemical Composition Limits

Weight%

C

Mn

Si

P

S

Cr

Ni

Mo

Cu

Al

Sn

Alloy 430

0.12 max

1.00

1.00

0.04

0.03

16-18

0.75 max

0.50

0.50

0.05

0.05

Typical Mechanical Properties:

Grade

Tensile Strength (MPa) min

Yield Strength 0.2% Proof (MPa) min

Elongation (% in 50mm) min

Hardness

Rockwell B (HR B) max

Brinell (HB) max

430

483

310

22

85

183



Chemical Composition:

440C Stainless

Nickel (Ni)

0.75%


Molybdenum

0.75%


Copper (Cu)

0.5%


Manganese

1% max


Iron (Fe)

Balance


Carbon (C)

0.95 – 1.2%


Chromium (Cr)

16 – 18%


Manganese (Mn)

1% max


Phosphorus (P)

0.04% max


Sulphur (S)

0.03% max


Silicon (Si)

1% max


The key applications of grade 420 stainless steels include:
Shear blades
Needle valves
Surgical equipment

Cutlery


The following are the applications for stainless steel grade 430:
Dish washer linings
Refrigerator cabinet panels
Element supports and fasteners
Stove trim rings and chimney liners
Automotive trim and lashing wires



Grade 440C stainless steel is used in the following applications:
Gage blocks
Cutlery
Ball bearings and races
Molds and dies
Knives
Valve components
Measuring instruments


The  bars  are  wrapped with anti-rust paper and steel rings to prevent damage. Identification labels are tagged according to standard specification or customer's instructions. Special packing is available as per customer's requirement.Ply wooden box are available for special protection. Other kinds of packing can be offered if request.
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