S31042 Pipes & Tubes are high temperature austenitic stainless steel products designed for high-temperature boiler applications, which require creep strength and steam oxidation resistance. The grade, known as TP310HCbN or HR3C, is one of the several grades that have been developed for the heat resistant applications. The grade is generally a 19:24:19 grade containing approximately 24–26% chromium, 19–22% nickel, with controlled amounts of 0.20–0.60% niobium and 0.15–0.35% nitrogen. These alloying elements help create strengthening precipitates that enhance resistance to high-temperature, long-term performance. S31042 tubes are commonly used in the superheater and reheater sections of supercritical and ultra-supercritical boilers, and are made to ASME SA213/ASTM A213 standards. The material also has improved steam oxidation resistance as compared to the traditional 18Cr austenitic grades. Amardeep Steel produces and provides S31042 Pipes & Tubes for the critical power generation applications.
Specifications of S31042 Pipes and Tubes
Parameter | Details |
|---|---|
Grade | UNS S31042, TP310HCbN, EN 1.4952, commonly known as HR3C |
Seamless tube | ASTM A213 / ASME SA213 (boiler, superheater and heat exchanger tubes) |
Seamless pipe | ASTM A312 / ASME SA312 TP310HCbN where listed in the edition on order |
Code approvals | ASME Code Case 2115, VdTÜV material data sheet 546 |
Tube sizes | 25 mm to 76.2 mm OD and 3 mm to 12.5 mm wall as standard; other sizes on request |
Manufacture | Hot extruded or cold drawn seamless |
Heat treatment | Solution treated at 1040°C (1900°F) minimum, water quenched or rapidly cooled |
Grain size | ASTM No. 7 or coarser |
Finish | Pickled; bright annealed on request |
Length | Random, fixed and cut lengths; U-bends on request |
Certification | EN 10204 3.1, 3.2 with third party inspection; IBR on request |
Chemical Compositions of S31042 Pipes and Tubes
Element | ASTM A213 / ASME SA213 TP310HCbN (%) |
|---|---|
Carbon (C) | 0.04 to 0.10 |
Manganese (Mn) | 2.00 max |
Phosphorus (P) | 0.045 max |
Sulphur (S) | 0.030 max |
Silicon (Si) | 1.00 max |
Chromium (Cr) | 24.0 to 26.0 |
Nickel (Ni) | 19.0 to 22.0 |
Niobium (Nb) | 0.20 to 0.60 |
Nitrogen (N) | 0.15 to 0.35 |
S31042 Pipes and Tubes Mechanical Properties
Property (ASTM A213, solution treated) | Value |
|---|---|
Tensile strength, min | 655 MPa (95 ksi) |
Yield strength (0.2% offset), min | 295 MPa (43 ksi) |
Elongation in 50 mm, min | 30% |
Hardness, max | 256 HBW / 100 HRB |
Physical Properties of S31042 Pipes and Tubes
Property | Value |
|---|---|
Density | About 7.9 g/cm³ |
Magnetic | Non-magnetic (austenitic) |
Thermal conductivity, expansion, modulus | Supplied on mill datasheet per heat lot |
Equivalent Grades of S31042 Pipes and Tubes
Standard | Designation |
|---|---|
UNS | S31042 |
ASTM / ASME grade | TP310HCbN (A213 / SA213) |
EN / Werkstoff | 1.4952 (X6CrNiNbN25-20) |
JIS | SUS310J1TB |
Common name | HR3C |
Code approvals | ASME Code Case 2115, VdTÜV 546 |
Weight Chart of S31042 Pipes and Tubes
OD (mm) | WT 4.5 mm | WT 5.6 mm | WT 7.1 mm | WT 8.8 mm | WT 10.0 mm | WT 12.5 mm |
|---|---|---|---|---|---|---|
25.4 | 2.33 | 2.75 | Not made | Not made | Not made | Not made |
31.8 | 3.05 | 3.64 | 4.35 | Not made | Not made | Not made |
38.1 | 3.75 | 4.52 | 5.46 | 6.40 | Not made | Not made |
44.5 | 4.47 | 5.41 | 6.59 | 7.80 | 8.56 | Not made |
50.8 | 5.17 | 6.28 | 7.70 | 9.17 | 10.13 | 11.88 |
57.0 | 5.86 | 7.14 | 8.79 | 10.53 | 11.66 | 13.81 |
63.5 | 6.59 | 8.05 | 9.94 | 11.95 | 13.28 | 15.82 |
76.2 | 8.01 | 9.81 | 12.18 | 14.72 | 16.43 | 19.76 |
114.3 | 12.26 | 15.11 | 18.89 | 23.04 | 25.89 | 31.58 |
Applications and Industrial Uses of S31042 Pipes and Tubes
- Supercritical Boiler Superheater Tubes
- Ultra-Supercritical Boiler Superheater Tubes
- Boiler Reheater Tubes
- Black Liquor Recovery Boiler Heat Exchangers
- Refuse Incineration Boiler Heat Exchangers
- Biomass Boiler Heat Exchangers
- High-Temperature Steam Boiler Systems
- Advanced Ultra-Supercritical Power Plant Boilers
Frequently Asked Questions
What are S31042 Pipes and Tubes?
S31042 Pipes and Tubes are 25Cr-20Ni austenitic stainless steel products designed for high-temperature boiler and heat-exchanger applications.
What is S31042 also known as?
S31042 is also known as TP310HCbN, HR3C, or 25Cr-20Ni-Nb-N stainless steel.
What is the difference between S31042 and TP310H?
S31042 contains controlled niobium and nitrogen additions, providing higher strength and creep resistance than TP310H.
What ASTM standard covers S31042 Pipes and Tubes?
S31042 tubes are covered by ASTM A213 / ASME SA213 TP310HCbN requirements.
Why is S31042 used in superheater and reheater tubes?
It provides high creep strength and excellent steam oxidation resistance for demanding high-temperature boiler service.
Is S31042 resistant to steam oxidation and high-temperature corrosion?
Yes, its 25% chromium and 20% nickel composition provides strong resistance to steam oxidation and high-temperature corrosion.
Can S31042 Pipes and Tubes be welded?
Yes, S31042 can be welded, with weldability reported as comparable to TP347H.
