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431 Stainless Steel Round Bar

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431 Stainless Steel Round Bar Suppliers & Manufacturers

431 Stainless Steel Round Bar

Sachin Steel is a trusted manufacturer, supplier, and exporter of 431 Stainless Steel Round Bars, delivering quality products to both domestic and international markets. Grade 431 is a nickel-containing martensitic stainless steel that offers higher corrosion resistance and mechanical strength compared to standard chromium stainless steels. 

The manufacturing process involves melting and refining the steel, casting it into billets, and hot rolling or forging it into round bar form. Heat treatment processes like quenching and tempering further enhance hardness, tensile strength, and resistance to wear. To improve surface quality and corrosion resistance, the bars undergo finishing processes such as grinding and polishing, followed by strict quality testing.

431 stainless steel round bars are widely used in industries such as marine, automotive, chemical processing, and engineering. Common applications include pump shafts, fasteners, valve components, and machine parts that require both strength and resistance to corrosive environments. With excellent performance up to 500°C and good machinability, this grade is an ideal choice for demanding industrial applications.

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431 Stainless Cold Finish Round Bar, ASME /EN/ BS SS 431 Rectangular Bar, Stainless Steel 431 Square Bar, Steel S43100 Bright Bar Manufacturer, stockist, suppliers and Exporter

Table Of Content

431 Stainless Steel Round Bar

431 Stainless Steel Round Bar is a high-strength martensitic stainless steel grade containing both chromium and nickel, which provides an excellent balance of toughness, hardness, and corrosion resistance. It offers superior mechanical properties compared to straight chromium stainless steels, making it highly suitable for demanding applications.

This grade delivers excellent impact strength even at high hardness levels and is capable of withstanding working temperatures up to 500°C. With good machinability and high polishability, 431 stainless steel is widely used for manufacturing precision components. It is especially resistant to oxidizing environments and strong acids such as nitric acid, making it ideal for chemical, marine, and engineering applications.

Types of 431 Stainless Steel Round Bars

Hex Bar

Stainless Steel 431 Hex Bar

Bright Bar

Stainless Steel 431 Bright Bar

Rectangular Bar

Stainless Steel 431 Hollow Bar

Square Bar

Stainless Steel 431 Square Bar

Polished Bar

Stainless Steel 431 Forged Bar

roundbar

Stainless Steel 431 Round Bar

Request Quote on Types of 431 SS Round Bar
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DIN 1.4057 SS Bars, Steel 431 Flat Bar, 431 Steel Hollow Bars, ASTM A276 AISI 431 Stainless Steel Round Bars, 431 Stainless Steel Black Bar Supplier

Specifications of 431 Stainless Steel Round Bar

Dimensions EN, DIN, JIS, ASTM, BS, ASME, AISI
Standard ASTM A276, ASTM A479
Material Grade Stainless Steel 431 (UNS S43100)
Round Bars Outside Diameter: 4 mm – 500 mm
Bright Bars Outside Diameter: 4 mm – 100 mm
Hex Bars 18 mm – 57 mm (11/16″ – 2-3/4″)
Square Bars 18 mm – 47 mm (11/16″ – 1-3/4″)
Flats Width: 1/2″ – 10″   |   Thickness: 2 mm – 150 mm
Custom Size Flats available
Length 1 – 6 Meters, Custom Cut Lengths
Form Round, Square, Hex (A/F), Rectangle, Billet, Ingot, Forging, etc.
Finish Black, Bright Polished, Rough Turned, NO.4 Finish, Matt Finish, BA Finish

Chemical Composition of Stainless Steel 431 Round Bar

Element

Percentage

Carbon (C)

0.20%

Manganese (Mn)

1.00% max

Silicon (Si)

1.00% max

Phosphorus (P)

0.04% max

Sulfur (S)

0.03% max

Chromium (Cr)

15.00 – 17.00%

Nickel (Ni)

1.25 – 2.50% max

Iron (Fe)

Balance

Equivalent Grades of 431 Stainless Steel Round Bar

Grade

Standard

1.4057

EN 10088-3

UNS S43100

ASTM A276/A479

SUS 431

JIS G4303

420 Stainless Steel Round Bars Size Chart

Nominal Diameter (mm)Nominal Diameter (Inches)Length (mm)Finish OptionsTolerancesProcess
40.157″1000 – 6000Bright, Polishedh9Cold Drawn
60.236″1000 – 6000Bright, Polishedh9Cold Drawn
100.393″1000 – 6000Bright, Polishedh9Cold Drawn
120.472″1000 – 6000Bright, Polishedh9Cold Drawn
160.630″1000 – 6000Bright, Polishedh9Cold Drawn
200.787″1000 – 6000Peeled, Polishedh11Cold Drawn
250.984″1000 – 6000Peeled, Polishedh11Cold Drawn
301.181″1000 – 6000Peeled, Polishedh11Cold Drawn
401.575″1000 – 6000Black, Rough Turnedh11Hot Rolled
501.969″1000 – 6000Black, Rough Turnedh11Hot Rolled
602.362″1000 – 6000Black, Rough Turnedh13Hot Rolled
803.150″1000 – 6000Black, Rough Turnedh13Hot Rolled
1003.937″1000 – 6000Black, Rough Turnedh13Hot Rolled
1505.906″CustomBlack, Rough TurnedAs per SpecForged
2007.874″CustomBlack, Rough TurnedAs per SpecForged
2509.843″CustomBlack, Rough TurnedAs per SpecForged
30011.811″CustomBlack, Rough TurnedAs per SpecForged

Mechanical Properties of SS 431 Round Bar

Property

Value

Tensile Strength

550 MPa (min)

Yield Strength

250 MPa (min)

Elongation

12% (min)

Hardness (Brinell-HBW)

285

Modulus of Elasticity

200 GPa

430F Stainless Steel Round Bar Dimensional Tolerances

TypeDiameter / Width (mm)Length (mm)TolerancesFinish OptionsStandardsManufacturing Process
Round Bars4 – 5001000 – 6000h9, h11, h13Bright, Black, Peeled, PolishedASTM A276, ASTM A479, ASME SA276, ASME SA479Hot Rolled, Cold Drawn, Forged
Square Bars6×6 – 150×1501000 – 6000±0.5mmHot Rolled, Cold Drawn, BrightASTM A276, ASTM A484Hot Rolled, Cold Drawn
Flat Bars3×10 – 100×5001000 – 6000±0.5mmMill Finish, PolishedASTM A276, ASTM A484Hot Rolled, Sheared & Edged
Hex Bars6 – 1051000 – 6000h11, h13Cold Drawn, PolishedASTM A276, ASTM A479Cold Drawn, Hot Rolled
Forged Bars50 – 500As RequiredAs per specBlack, Rough TurnedASTM A182, ASTM A276Forged, Rough Machined

420 Stainless Round Bars Weight Chart

DiameterWeight ChartDiaWeight Chart
(mm)per metre (kg)(in)per metre (kg)
3mm0.061/8″0.06
4mm0.103/16″0.14
5mm0.161/4″0.25
6mm0.225/16″0.39
7mm0.303/8″0.56
8mm0.407/16″0.77
10mm0.621/2″1.00
12mm0.899/16″1.22
14mm1.225/8″1.56
15mm1.4011/16″1.89
16mm1.593/4″2.25
18mm2.017/8″3.07
20mm2.481″4.03
22mm3.00
24mm3.57
25mm3.88

Stainless Steel 431 Round Bar Physical Properties

Element SS 431
Density 0.2800 lb/inch³
Electrical Resistivity 70° Ohms (circ mil./ft.)
Modulus of Elasticity 29.0 X 10^3

Application of 431 Stainless Steel Round Bar

    • Petrochemical Industry
    • Chemical Industry
    • Oil and Gas Industry
    • Pulp & Paper Indusry
    • Power Plant Industry
    • Food Processing Industry
    • Pharmaceuticals Industry
    • Energy Industry
    • Aerospace Industry
Application Industries

FAQs About Stainless Steel 431 Round Bars

431 stainless steel round bar is a martensitic stainless steel grade with added chromium and nickel, offering high tensile strength, hardness, good corrosion resistance especially in oxidizing environments, and good polishability.

Common standards include ASTM A276 for bars, AMS 5628, ASTM A479 etc. These ensure consistency in chemical composition, mechanical strength, and finish.

SS 431 is typically hardened by heating and then tempered. The heat treatment improves hardness and mechanical strength. Annealed condition is also available but with lower strength

Automotive, chemical, petrochemical, marine, construction, and machinery manufacturing industries frequently use SS 431 bars for high-strength, corrosion-resistant components.

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