ASTM A182 F304L

UNS S30403

ASTM A182 F304L material

stainless steelflange / forgingP-No. 8 / Gr. 1

⚡

Key Engineering Metrics

Instant specifications summary for ASTM A182 F304L

Yield Strength💪

170.0MPa

Min specified

Tensile Strength🏋️

485.0MPa

Ultimate min

Carbon Eq. (CE)🧪

N/A

IIW Formula

P-No. / Group⚙️

P8 / Gr1

ASME Sec. IX

Flange Group🛡️

Grp 2.3

ASME B16.5

MDMT Curve❄️

Generally exempt

ASME B31.3

General Specifications & Standard Data

ASTM A182

Standard Specification

ASTM A182

Grade / Designation

F304L

UNS Designation

S30403

ASME P-No. / Group No.

P-No. 8 / Group 1

ASME B31.3 MDMT Curve

Generally exempt down to -196°C (B31.3)

Minimum Design Metal Temperature rules for impact testing exemption under ASME B31.3 paragraph 323.2.2.

Mechanical Properties

Room Temp (20°C / 68°F)

Yield-to-Tensile Ratio35%

Yield Strength (170.0 MPa)Tensile Strength (485.0 MPa)

Density

8000kg/m³

Min Yield

170.0MPa

Min Tensile

485.0MPa

Elastic Modulus

193GPa

Elongation (min)

30%

Thermal Expansion

17.2µm/m·K

Thermal Cond.

16.2W/m·K

Poisson’s Ratio

0.3

Allowable Stress Data (ASME B31.3 Table A-1)

asme-bpvc

Allowable Stress vs Temperature

ASME B31.3 / BPVC Section II Part D Reference Curve

Max: 115.1 MPaRange: 38° - 600°

Temperature (°C)	Allowable Stress (MPa)	% of Room Temp Rating
38	115.1	100%
100	114.5	99%
150	111.7	97%
200	107.6	93%
250	102.7	89%
300	97.9	85%
350	94.5	82%
400	91.7	80%
450	88.3	77%
500	73.1	63%
550	49.0	43%
600	33.1	29%
650	–	–

🛡️ ASME B16.5 Flange P-T Ratings & Calculator

Material Group 2.3 (Stainless steel materials)

bar / °C

Rating Class: Class 150

Max Allowable Pressure15.9 bar

Design Temp (°C):

Code Limit: -29° to 450°

Temp (°C)	Class 150	Class 300	Class 400	Class 600	Class 900	Class 1500	Class 2500
-29 to 38	15.9	41.4	55.2	82.7	124.1	206.8	344.7
50	15.3	40	53.4	80	120.1	200.1	333.5
100	13.3	34.8	46.4	69.6	104.4	173.9	289.9
150	12	31.4	41.9	62.8	94.2	157	261.6
200	11.2	29.2	38.9	58.3	87.5	145.8	243
250	10.5	27.5	36.6	54.9	82.4	137.3	228.9
300	10	26.1	34.8	52.1	78.2	130.3	217.2
325	9.3	25.5	34	51	76.4	127.4	212.3
350	8.4	25.1	33.4	50.1	75.2	125.4	208.9
375	7.4	24.8	33	49.5	74.3	123.8	206.3
400	6.5	24.3	32.4	48.6	72.9	121.5	202.5
425	5.5	23.9	31.8	47.7	71.6	119.3	198.8
450	4.6	23.4	31.2	46.8	70.2	117.1	195.1

Working pressures are in gauge (bar). Values interpolated linearly for intermediate temperatures per ASME B16.5 para. 2.3.

Chemical Composition (% Weight)

Heat & Product Analysis

≤ 0.03%

≤ 2%

≤ 1%

≤ 0.045%

≤ 0.03%

18–20%

8–12%

≤ 0.1%

🛡️ Service Compatibility

Cryogenic & LNG ( 196°C)excellent

Retains high impact toughness down to -196°C (-320°F). Standard for LNG & liquid nitrogen.

Oxidizing Acids & Chemicalexcellent

Superior resistance to nitric acid, organic acids, and pharmaceutical process streams.

High Purity Steam & Waterexcellent

Zero rust/iron contamination for DI water, pure steam, and food/beverage lines.

Sour Service (H2S)good

NACE MR0175 compliant for low-severity sour service without PWHT.

Chlorides & Seawaternot-recommended

High susceptibility to pitting and Chloride Stress Corrosion Cracking (CSCC) >60°C.

🔥 Welding & Heat Treatment

Weldabilityeasy

Preheat Requirements

None required (ambient ≥ 10°C). Interpass temperature must be strictly controlled < 150°C (300°F) to prevent heat tint & carbide precipitation.

PWHT Requirements

PWHT is not recommended or required; causes chromium carbide sensitization. Full solution annealing at 1040°C + rapid quench if required.

Charpy Impact Test (CVN)

Exempt down to -196°C (-320°F) per ASME B31.3 Table 323.2.2 for base metal & filler metal.

⚠️ Engineering Verification Notice

Material property data provided is for preliminary engineering reference. Always verify properties against the latest ASME BPVC Section II, ASTM material specification, and Material Test Report (MTR/MTC).