Chemical composition 321 (UNS S32100/ EN1.4541) 321H (UNS S32109/EN 1.4878) Carbon, Max% 0.08 0.04-0.1 Manganese, Max% 2 2 Phosphorus, Max% 0.045 0.045 Sulphur, Max% 0.03 0.03 Silicon, Max% 0.75 0.75 Chromium Range% 17.0-19.0 17.0-19.0 Nickel Range% 9.0-12.0 9.0-12.0 Titanium Range% 5*(C+N)min, 0.7 max 4*(C+N)min, 0.7 max Nitrogen, Max% 0.1 –

Mechanical Properties 321 321H Tensile Min 75 ksi 75 ksi Yield Min 30 ksi 30 ksi Elongation Min 40% 40% Hardness Max 95 HRB 95 HRB

Common uses of Stainless Steel Sheet 321 include: Aircraft Exhaust Manifolds Expansion Joints Furnace Parts Heat Exchangers

Chemical composition 321 (UNS S32100/ EN1.4541) 321H (UNS S32109/EN 1.4878) Carbon, Max% 0.08 0.04-0.1 Manganese, Max% 2 2 Phosphorus, Max% 0.045 0.045 Sulphur, Max% 0.03 0.03 Silicon, Max% 0.75 0.75 Chromium Range% 17.0-19.0 17.0-19.0 Nickel Range% 9.0-12.0 9.0-12.0 Titanium Range% 5*(C+N)min, 0.7 max 4*(C+N)min, 0.7 max Nitrogen, Max% 0.1 –

Mechanical Properties 321 321H Tensile Min 75 ksi 75 ksi Yield Min 30 ksi 30 ksi Elongation Min 40% 40% Hardness Max 95 HRB 95 HRB

Common uses of Stainless Steel Sheet 321 include: Aircraft Exhaust Manifolds Expansion Joints Furnace Parts Heat Exchangers

321/321H Stainless Steel Plate

Grade: 321/321H

Thickness: 3.0mm-200mm

Width: 1.5m/2.0m/2.2m or as client’s requirement.

Standard: ASTM A240/A240M, JIS G4304, JISG 4305, EN 10088/3

Finish: No.1, Polished

Grade 321 stainless steel plate is a standard 18/8 chromium-nickel alloy reinforced by titanium and niobium. The addition of titanium stabilizes this alloy and removes its susceptibility to intergranular corrosion while mitigating carbide precipitation during welding. At elevated temperatures, it resists oxidation and has higher creep and rupture properties than 304/304L stainless steel.

Grade 321H stainless steel plate contains more carbon (between 0.04% to 0.1%) than regular 321 (≤0.08%), which enhances its high-temperature performance, including increasing its resistance to cracking or warping due to shifts in temperature.

Chemical composition	321 (UNS S32100/ EN1.4541)	321H (UNS S32109/EN 1.4878)
Carbon, Max%	0.08	0.04-0.1
Manganese, Max%	2	2
Phosphorus, Max%	0.045	0.045
Sulphur, Max%	0.03	0.03
Silicon, Max%	0.75	0.75
Chromium Range%	17.0-19.0	17.0-19.0
Nickel Range%	9.0-12.0	9.0-12.0
Titanium Range%	5*(C+N)min, 0.7 max	4*(C+N)min, 0.7 max
Nitrogen, Max%	0.1	–

Mechanical Properties	321	321H
Tensile Min	75 ksi	75 ksi
Yield Min	30 ksi	30 ksi
Elongation Min	40%	40%
Hardness Max	95 HRB	95 HRB

Common uses of Stainless Steel Sheet 321 include:

Aircraft Exhaust Manifolds
Expansion Joints
Furnace Parts
Heat Exchangers

Introduction

Specification

Chemical composition	321 (UNS S32100/ EN1.4541)	321H (UNS S32109/EN 1.4878)
Carbon, Max%	0.08	0.04-0.1
Manganese, Max%	2	2
Phosphorus, Max%	0.045	0.045
Sulphur, Max%	0.03	0.03
Silicon, Max%	0.75	0.75
Chromium Range%	17.0-19.0	17.0-19.0
Nickel Range%	9.0-12.0	9.0-12.0
Titanium Range%	5*(C+N)min, 0.7 max	4*(C+N)min, 0.7 max
Nitrogen, Max%	0.1	–