Chemical Composition Element Specified / Typical Range (wt. %) C ≤0.07 / ≤0.030 Mn ≤2.00 Si ≤1.00 P ≤0.045 S ≤0.030 Cr 18.0–20.0 Ni 8.0–11.0 Mo — N ≤0.10 Fe Balance Note: Values are presented as representative ASTM A182 grade requirements. The applicable standard edition and material certificate govern the final chemical limits.

Mechanical Properties Property Minimum / Requirement Tensile Strength, min. 515 MPa (F304) / 485 MPa (F304L) Yield Strength, 0.2%, min. 205 MPa (F304) / 170 MPa (F304L) Elongation, min. 30% Hardness As specified by applicable standard / product condition

Chemical and process piping Food, beverage and pharmaceutical equipment Water treatment and general utility piping Architectural and sanitary applications Heat exchangers and general industrial equipment

Chemical Composition Element Specified / Typical Range (wt. %) C ≤0.07 / ≤0.030 Mn ≤2.00 Si ≤1.00 P ≤0.045 S ≤0.030 Cr 18.0–20.0 Ni 8.0–11.0 Mo — N ≤0.10 Fe Balance Note: Values are presented as representative ASTM A182 grade requirements. The applicable standard edition and material certificate govern the final chemical limits.

Mechanical Properties Property Minimum / Requirement Tensile Strength, min. 515 MPa (F304) / 485 MPa (F304L) Yield Strength, 0.2%, min. 205 MPa (F304) / 170 MPa (F304L) Elongation, min. 30% Hardness As specified by applicable standard / product condition

Chemical and process piping Food, beverage and pharmaceutical equipment Water treatment and general utility piping Architectural and sanitary applications Heat exchangers and general industrial equipment

304/304L Stainless Steel Flange

Grade: 304/304L

Flange types：

Weld Neck (WN); Slip-On (SO); Blind (BL); Socket Weld (SW); Threaded (TH); Lap Joint (LJ); Orifice Flange where specified

Nominal size：

ASME: NPS 1/2–24 under B16.5; large diameter NPS 26–60 under B16.47; EN/JIS/GB/T sizes depend on applicable standard

Pressure rating：

ASME Class 150, 300, 400, 600, 900, 1500, 2500 (availability depends on size/type); EN/GB PN classes; JIS 5K–63K

304 and 304L are versatile chromium-nickel austenitic stainless steels offering good general corrosion resistance, excellent formability and weldability. 304 is widely used for general industrial service, while the lower-carbon 304L grade is preferred for welded construction where reduced sensitization risk is important. These grades provide a strong balance of cost, availability, fabrication performance and corrosion resistance.

Chemical Composition

Element	Specified / Typical Range (wt. %)
C	≤0.07 / ≤0.030
Mn	≤2.00
Si	≤1.00
P	≤0.045
S	≤0.030
Cr	18.0–20.0
Ni	8.0–11.0
Mo	—
N	≤0.10
Fe	Balance

Note: Values are presented as representative ASTM A182 grade requirements. The applicable standard edition and material certificate govern the final chemical limits.

Mechanical Properties

Property	Minimum / Requirement
Tensile Strength, min.	515 MPa (F304) / 485 MPa (F304L)
Yield Strength, 0.2%, min.	205 MPa (F304) / 170 MPa (F304L)
Elongation, min.	30%
Hardness	As specified by applicable standard / product condition

Chemical and process piping
Food, beverage and pharmaceutical equipment
Water treatment and general utility piping
Architectural and sanitary applications
Heat exchangers and general industrial equipment

Introduction

Specification

Chemical Composition

Element	Specified / Typical Range (wt. %)
C	≤0.07 / ≤0.030
Mn	≤2.00
Si	≤1.00
P	≤0.045
S	≤0.030
Cr	18.0–20.0
Ni	8.0–11.0
Mo	—
N	≤0.10
Fe	Balance

Note: Values are presented as representative ASTM A182 grade requirements. The applicable standard edition and material certificate govern the final chemical limits.

Mechanical

Mechanical Properties

Property	Minimum / Requirement
Tensile Strength, min.	515 MPa (F304) / 485 MPa (F304L)
Yield Strength, 0.2%, min.	205 MPa (F304) / 170 MPa (F304L)
Elongation, min.	30%
Hardness	As specified by applicable standard / product condition