ASTM A179

UNS K01200

ASTM A179 material

carbon steeltubeP-No. 1 / Gr. 1

⚡

Key Engineering Metrics

Instant specifications summary for ASTM A179

Yield Strength💪

180.0MPa

Min specified

Tensile Strength🏋️

325.0MPa

Ultimate min

Carbon Eq. (CE)🧪

0.475

High Cracking Risk

P-No. / Group⚙️

P1 / Gr1

ASME Sec. IX

Flange Group🛡️

N/A

ASME B16.5

MDMT Curve❄️

Refer to

ASME B31.3

General Specifications & Standard Data

ASTM A179

Standard Specification

ASTM A179

Grade / Designation

ASTM A179

UNS Designation

K01200

ASME P-No. / Group No.

P-No. 1 / Group 1

ASME B31.3 MDMT Curve

Refer to ASME B31.3 Fig 323.2.2A

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 Ratio55%

Yield Strength (180.0 MPa)Tensile Strength (325.0 MPa)

Density

7850kg/m³

Min Yield

180.0MPa

Min Tensile

325.0MPa

Elastic Modulus

200GPa

Elongation (min)

25%

Thermal Expansion

12µm/m·K

Thermal Cond.

50W/m·K

Poisson’s Ratio

0.3

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

asme-b31-3

Allowable Stress vs Temperature

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

Max: 137.9 MPaRange: 38° - 500°

Temperature (°C)	Allowable Stress (MPa)	% of Room Temp Rating
38	137.9	100%
100	137.9	100%
150	137.9	100%
200	131.0	95%
250	122.0	88%
300	115.0	83%
350	112.0	81%
400	108.0	78%
450	105.0	76%
500	102.0	74%

Chemical Composition (% Weight)

Heat & Product Analysis

Carbon Equivalent (CE - IIW Formula)

CE = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15

Preheat and strict PWHT required

0.475

High Cracking Risk

≤ 0.25%

≤ 1.35%

≤ 0.35%

≤ 0.035%

🛡️ Service Compatibility

Hydrocarbon (Sweet)excellent

Industry standard for crude oil, natural gas, LPG, and refined fuels up to 425°C.

Steam / Condensategood

Excellent for non-corrosive steam ≤425°C (800°F). Risk of graphitization above 425°C.

Cooling & Treated Watergood

Standard for treated boiler feed & cooling water. Untreated water requires corrosion allowance.

Sour Service (H2S)check

Requires NACE MR0175 / ISO 15156 compliance, hardness ≤22 HRC, and HIC/SSC testing.

Cryogenic / Low Tempnot-recommended

Risk of brittle failure below -29°C (-20°F). Use LTCS (A333 Gr. 6).

🔥 Welding & Heat Treatment

Weldabilityeasy

Preheat Requirements

10°C min; preheat required for heavy wall thickness per ASME B31.3.

PWHT Requirements

Required if nominal wall thickness t > 19mm (0.75 in) per ASME B31.3 Table 331.1.1.

Charpy Impact Test (CVN)

Exempt down to -29°C (-20°F) per B31.3 Fig 323.2.2A. Impact test required if MDMT is lower.

⚠️ 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).