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Pressure ratings of hastelloy pipe: schedule and temperature chart

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Alloy steel pipe is a kind of seamless steel pipe, its performance is much higher than the general seamless steel pipe, because this steel pipe inside containing Cr, high temperature resistance, low temperature, corrosion-resistant performance of other non-pipe joints not match, so the more extensive use of alloy tube in the petroleum, aerospace, chemical, electric power, boiler, military, and other industries.

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hastelloy pipe pressure rating, hastelloy x pipe, hastelloy c4 pipe, hastelloy c22 pipe

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Pressure ratings of hastelloy pipe: schedule and temperature chart

Date:2026-10-12

What Is the Pressure Rating of Hastelloy Pipe?

The pressure rating of Hastelloy X, C4, C22 and C276 pipe depends on pipe size, wall thickness, temperature, material properties, and applicable design requirements. Pipe schedules such as SCH 40, SCH 80, and SCH 160 indicate different wall thickness series and affect the pressure capacity of a pipe.

The following chart provides the pressure-rating values supplied for selected seamless pipe sizes and schedules at different temperatures. It can be used as a preliminary reference when comparing pipe dimensions and temperature conditions.

hastelloy pipe

Hastelloy Pipe Pressure Rating Chart

The table below reproduces the supplied data. Temperature columns remain in the original order to avoid changing the source values.

Pipe Schedule	Pipe Size (in.)	200°F	100°F	300°F	500°F	400°F	600°F	700°F	650°F	750°F
80	1	3634	4213	3265	2791	3002	2659	2528	2580	2501
40	1	2629	3048	2362	2019	2171	1924	1824	1867	1810
40	1.5	1947	2257	1750	1496	1608	1425	1354	1383	1340
160	1	5296	6140	4759	4068	4375	3876	3684	3761	3646
160	1.5	3984	4619	3580	3060	3291	2916	2772	2829	2743
80	1.5	2744	3182	2466	2108	2267	2009	1909	1949	1889
80	2	2369	2747	2129	1820	1957	1734	1648	1682	1631
40	2	1640	1902	1474	1260	1355	1201	1141	1165	1129
40	3	1558	1806	1400	1196	1287	1140	1084	1106	1072
160	2	3880	4499	3486	2980	3205	2840	2699	2755	2671
160	3	3312	3840	2976	2544	2736	2424	2304	2352	2280
80	3	2202	2553	1979	1691	1819	1612	1532	1564	1516
80	4	1909	2213	1715	1466	1577	1397	1328	1355	1314
40	4	1321	1531	1187	1014	1091	967	919	938	909
40	5	1158	1342	1040	889	956	847	805	822	797
160	4	3106	3601	2791	2386	2566	2273	2161	2206	2138
80	5	1709	1981	1535	1312	1411	1250	1189	1213	1176
160	5	2945	3414	2646	2262	2433	2155	2049	2091	2027
80	6	1650	1913	1483	1267	1363	1208	1148	1172	1136
40	6	1052	1219	945	808	869	770	732	747	724
40	8	926	1073	832	711	765	678	644	657	637
160	6	2836	3289	2549	2179	2343	2076	1973	2014	1953
160	8	2738	3175	2460	2103	2262	2004	1905	1944	1885
80	8	1459	1692	1311	1121	1205	1068	1015	1036	1005
80	10	1388	1609	1247	1066	1147	1016	966	986	956
40	10	840	974	755	945	694	615	584	596	578
160	10	2714	3147	2439	2085	2242	1986	1880	1927	1868

Important: The source table does not specify the pressure unit or the calculation standard. The value of 945 for the 10-inch Schedule 40 pipe at 500°F also appears inconsistent with the surrounding temperature trend and should be verified against the original engineering data before use.

How Do Pipe Schedule and Temperature Affect Pressure Rating?

1. Pipe Schedule

For the same nominal pipe size, a higher schedule generally means a thicker wall. For example, the supplied chart lists higher pressure-rating values for Schedule 160 than for Schedule 40 at the same listed size and temperature.

However, schedule alone does not establish the allowable operating pressure. The material specification, actual dimensions, design code, and service conditions must also be considered.

2. Operating Temperature

The pressure capacity of metallic piping generally changes with temperature because material strength and allowable stress vary under elevated-temperature conditions. The supplied chart shows this trend for most listed combinations.

Engineers should use the temperature corresponding to the actual design condition and verify the value against the applicable piping code.

3. Pipe Size

Pipe size also affects pressure design. Outside diameter and wall thickness are key inputs when determining the pressure capacity of a straight pipe. Larger nominal sizes do not automatically mean higher pressure capacity; the complete dimensional and material specification matters.

How to Use the Hastelloy Pipe Pressure Chart

Before using the chart for engineering or procurement, confirm the following:

Material grade: Verify whether the pipe is Hastelloy X, C4, C22, or C276.

Pipe dimensions: Confirm nominal size, outside diameter, wall thickness, and schedule.

Design temperature: Match the required operating and design temperatures.

Pressure unit and calculation basis: Confirm the unit and applicable standard behind the tabulated values.

Service conditions: Consider corrosion allowance, fluid characteristics, connections, and other design requirements.

The table is a preliminary reference, not a substitute for a code-based pressure design calculation. The available data also do not establish separate, grade-specific ratings for Hastelloy X, C4, C22, and C276.

Conclusion

The pressure rating of Hastelloy pipe depends on the relationship between pipe schedule, dimensions, temperature, and material properties. The supplied chart provides a starting point for comparing selected seamless pipe sizes, but its units and calculation basis must be confirmed before the values are used for design or procurement.