ASTM A217 WC6

UNS J12072

ASTM A217 WC6 material

alloy steelvalve body / castingP-No. 4 / Gr. 1

⚡

Key Engineering Metrics

Instant specifications summary for ASTM A217 WC6

Yield Strength💪

275.0MPa

Min specified

Tensile Strength🏋️

485.0MPa

Ultimate min

Carbon Eq. (CE)🧪

0.817

High Cracking Risk

P-No. / Group⚙️

P4 / Gr1

ASME Sec. IX

Flange Group🛡️

Grp 1.9

ASME B16.5

MDMT Curve❄️

Refer to

ASME B31.3

General Specifications & Standard Data

ASTM A217

Standard Specification

ASTM A217

Grade / Designation

WC6

UNS Designation

J12072

ASME P-No. / Group No.

P-No. 4 / 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 Ratio57%

Yield Strength (275.0 MPa)Tensile Strength (485.0 MPa)

Density

7850kg/m³

Min Yield

275.0MPa

Min Tensile

485.0MPa

Elastic Modulus

205GPa

Elongation (min)

20%

Thermal Expansion

12µm/m·K

Thermal Cond.

42W/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: 137.9 MPaRange: 38° - 550°

Temperature (°C)	Allowable Stress (MPa)	% of Room Temp Rating
38	137.9	100%
100	137.9	100%
150	137.9	100%
200	137.9	100%
250	137.9	100%
300	137.9	100%
350	137.9	100%
400	135.8	99%
450	129.6	94%
500	75.2	55%
550	37.2	27%
600	–	–
650	–	–

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

Material Group 1.9 (Carbon and low-alloy steel materials)

bar / °C

Rating Class: Class 150

Max Allowable Pressure19.8 bar

Design Temp (°C):

Code Limit: -29° to 650°

Temp (°C)	Class 150	Class 300	Class 400	Class 600	Class 900	Class 1500	Class 2500
-29 to 38	19.8	51.7	68.9	103.4	155.1	258.6	430.9
50	19.5	51.7	68.9	103.4	155.1	258.6	430.9
100	17.7	51.5	68.6	103	154.4	257.4	429
150	15.8	49.7	66.3	99.5	149.2	248.7	414.5
200	13.8	48	63.9	95.9	143.9	239.8	399.6
250	12.1	46.3	61.7	92.7	139	231.8	386.2
300	10.2	42.9	57	85.7	128.6	214.4	357.1
325	9.3	41.4	55	82.6	124	206.6	344.3
350	8.4	40.3	53.6	80.4	120.7	201.1	335.3
375	7.4	38.9	51.6	77.6	116.5	194.1	323.2
400	6.5	36.5	48.9	73.3	109.8	183.1	304.9
425	5.5	35.2	46.5	70	105.1	175.1	291.6
450	4.6	33.7	45.1	67.7	101.4	169	281.8
475	3.7	31.7	42.3	63.4	95.1	158.2	263.9
500	2.8	25.7	34.3	51.5	77.2	128.6	214.4
538	1.4	14.9	19.9	29.8	44.7	74.5	124.1
550	–	12.7	16.9	25.4	38.1	63.5	105.9
575	–	8.8	11.7	17.6	26.4	44	73.4
600	–	6.1	8.1	12.2	18.3	30.5	50.9
625	–	4.3	5.7	8.5	12.8	21.3	35.5
650	–	2.8	3.8	5.7	8.5	14.2	23.6

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

Carbon Equivalent (CE - IIW Formula)

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

Preheat and strict PWHT required

0.817

High Cracking Risk

≤ 0.2%

0.5–0.8%

≤ 0.6%

≤ 0.04%

≤ 0.045%

1–1.5%

≤ 0.5%

0.45–0.65%

≤ 0.3%

🛡️ Service Compatibility

High Temp Superheated Steamexcellent

Industry standard for main steam & reheat piping up to 593°C (1100°F) for P91.

High Temp Hydrogen (HTHA)excellent

Resistant to High Temperature Hydrogen Attack per API RP 941 (Nelson Curves).

Hydrocarbon Crackinggood

High creep-rupture strength in refinery vacuum furnaces and hydrocrackers.

Wet H2S / Sour Servicenot-recommended

High weld heat-affected zone hardness; requires strict PWHT to prevent SSC.

Cryogenic / Low Tempnot-recommended

High ductile-to-brittle transition temp; strictly high-temperature service.

🔥 Welding & Heat Treatment

Weldabilityspecial control required

Preheat Requirements

Mandatory preheat: 150°C–200°C for P11/P22; 200°C–250°C for P91/C12A. Maintain preheat until PWHT or post-bake.

PWHT Requirements

Mandatory post-weld heat treatment for all thicknesses: P11/P22 (650°C–700°C), P91 (730°C–760°C) per ASME B31.3 Table 331.1.1.

Charpy Impact Test (CVN)

Impact testing required for low-temperature applications or code thickness thresholds.

⚠️ 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).