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Stainless Steel Alloy 420 Flanges

Stainless Steel Alloy 420 Flanges | SS Alloy 420 Flanges | SS Alloy 420 Flanges Manufacturer | SS Alloy 420 Flanges Exporter

Grade 420 Flanges stainless steel is a high-carbon steel with a minimum chromium content of 12%. Like any other stainless steel, grade 420 can also be hardened through heat treatment. It offers good ductility in its annealed state and excellent corrosion resistance properties when the metal is polished, surface grounded or hardened. This grade has the highest hardness - 50HRC - among all the stainless steel grades with 12% chromium.

Stainless steel grades that are similar to grade 420 stainless steels flanges include martensitic steels such as the other versions of grade 420, having vanadium, sulphur and molybdenum in their composition, and the grade 440 series. Non-standard grade 420C has carbon content that is little higher than that of grade 420.

Martensitic stainless steels are ones with high hardness and high carbon content. These steels are generally fabricated using methods that require hardening and tempering treatments. The operating conditions of martensitic steels are affected by loss of material’s strength at high temperatures, and decrease in ductility at negative temperatures. The following properties are mentioned for bar products in ASTM A276. The specification may not necessarily be similar for other forms, such as forgings and plate.

Applications

  • Aerospace – piston engine manifolds
  • Chemical Processing
  • Expansion Joints
  • Food Processing – equipment and storage
  • Petroleum Refining – polythionic acid service
  • Waste Treatment – thermal oxidizers

Benefits

  • Higher creep stress and rupture properties when compared with 304
  • Ideal for high temperature service
  • Overcomes sensitization and intergranular corrosion concerns
  • Can be used in elevated temperature applications for ASME Boiler and Pressure Vessel Code applications
  • Excellent mechanical properties

Chemical Composition

Grade

C

Mn

Si

P

S

Cr

420

min.

max.

0.15

-

-

1

-

1

-

0.040

-

0.03

12.0

14.0

Mechanical Properties

Tempering Temperature (°C)

Tensile Strength (MPa)

Yield Strength
0.2% Proof (MPa)

Elongation (% in 50mm)

Hardness Brinell (HB)

Impact Charpy V (J)

Annealed *

655

345

25

241 max

-

204

1600

1360

12

444

20

316

1580

1365

14

444

19

427

1620

1420

10

461

#

538

1305

1095

15

375

#

593

1035

810

18

302

22

650

895

680

20

262

42

* Annealed tensile properties are typical for Condition A of ASTM A276; annealed hardness is the specified maximum.
# Tempering of this steel should be avoided in the range 425-600°C

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