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Stainless Steel 304H Fittings Supplier and Exporter
Stainless Steel 304H Fittings are high-carbon austenitic stainless steel fittings, specially designed for high temperature and pressure use. This Grade 304H has a higher carbon level which provides greater creep strength and improved mechanical properties at high temperatures (above 800°F/427°C). The fittings are durable, resistant to oxidation and easy to weld and are ideal for demanding industrial environments. Stainless Steel 304H Buttweld Fittings are used in applications requiring high-temperature strength, such as power generation systems, petrochemical plants, pressure vessels, boilers, and heat exchangers. Annealing treatment is used following welding or cold forming to re-establish the microstructure and enhance corrosion resistance. Elbows, tees, reducers, crosses and stub ends give assurance of process pipe flow control. Solitaire Overseas offers high end quality Stainless Steel 304H Fittings, which are produced according to international standards for industrial use.
Table of Content
- Specification of Stainless Steel 304H Fittings
- Chemical Composition of Stainless Steel 304H Fittings
- Mechanical Properties of Stainless Steel 304H Fittings
- Types of Stainless Steel 304H Fittings
- Equivalent Grades of Stainless Steel 304H Fittings
- SS 304H Fittings - Heat Treatment & Dimensional Requirements
- Application & Industrial Uses of Stainless Steel 304H Fittings
- Frequently Asked Questions
Specification of Stainless Steel 304H Fittings
| Parameter | Details |
|---|---|
| Material Grade | Stainless Steel 304H / UNS S30409 |
| International Standards | DIN 1.4948 / EN X6CrNi18-10 |
| Buttweld Standard | ASTM A403 WP304H |
| Forged Standard | ASTM A182 F304H |
| ASME Equivalent | ASME SA403 WP304H / SA182 F304H |
| Dimensional Specs | Buttweld: ASME B16.9, MSS SP-43 Forged: ASME B16.11, MSS SP-79 |
| Forms Available | Elbow, Tee, Reducer, Cap, Stub End, Lap Joint, Cross, Coupling, Union, Plug, Bushing, Insert |
| Size Range | Buttweld: 1/2" NB to 48" NB Forged: 1/8" NPS to 4" NPS |
| Pressure / Schedule | BW: SCH 5S to XXS Forged: Class 2000, 3000, 6000, 9000 |
| Connection Ends | Beveled End (BE), Plain End (PE), Threaded End (TE) |
| Quality Control | PMI Testing, MTC EN 10204 3.1/3.2, Third-Party Inspection |
| Surface Finish | Pickled, Annealed, Polished (2B, No.4, Mirror) |
| Lead Time | Stock: Immediate; Custom: 4-8 weeks |
Chemical Composition of Stainless Steel 304H Fittings
| Grade | Carbon (C) | Mn | Silicon (Si) | P | Sulfur (S) | Chromium (Cr) | Molybdenum (Mo) | Nickel (Ni) | Nitrogen (N) | |
|---|---|---|---|---|---|---|---|---|---|---|
| 304H | min. | 0.04 | - | - | - | - | 18.0 | - | 8.0 | - |
| max. | 0.10 | 2.0 | 0.75 | 0.045 | 0.03 | 20.0 | - | 10.5 | - |
Mechanical Properties of Stainless Steel 304H Fittings
| Grade | Density | Melting Point | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness (Rockwell B) max | Hardness (Brinell HB) max |
|---|---|---|---|---|---|---|---|
| 304H | 8.0 g/cm³ | 1400°C - 1450°C (2550°F - 2640°F) | 515 | 205 | 40 | 92 | 201 |
Types of Stainless Steel 304H Fittings
Cap
Union
Boss
Bushing
Coupling
Cross
Elbow
Nipples
Plug
Tee
Equivalent Grades of Stainless Steel 304H Fittings
| Grade | UNS No. | Old British | Euronorm No. | Euronorm Name | Swedish SS | Japanese JIS | BS En |
|---|---|---|---|---|---|---|---|
| 304H | S30409 | 304S51 | 1.4948 | X6CrNi18-10 | 2332 | SUS 304H | 58E |
SS 304H Fittings - Heat Treatment & Dimensional Requirements
The stainless steel 304H comes with different carbon content and is also made with different heat treatment methods. It also comes in different dimensions. The information regarding heat treatment and tolerance is given below.
Heat Treatment Method
The temperature that can be used during solution annealing of the ASTM A403 WP304H Fittings material should exceed 1040°C/1900°F. The cooling procedure will take place at a relatively fast pace. This method will help to maintain the material structure at 100% austenite and increase high-temperature mechanical properties along with increased corrosion and oxidation resistance.
Dimensions
The stainless steel 304H Buttweld Fittings ASME will be produced with an eye for achieving the necessary accuracy in dimensions required for proper fit-up and trouble-free installation. Important dimensions to achieve include wall thickness consistency, center-end distances, appropriate angular relationship, and properly prepared beveled ends for consistent welding results and reliable pipe connections.
Application & Industrial Uses of Stainless Steel 304H Fittings
- Power Generation
- Petroleum Refining
- Petrochemical & Chemical Industry
- Industrial Furnaces & Kiln
- Waste Incineration
- Aerospace
- Superheater & Reheater Tube Assemblies
- Emission Control Systems
- Mineral Processing
Frequently Asked Questions
Stainless Steel 304H is a high-carbon austenitic stainless steel grade designed for elevated temperature and high-pressure applications.
304H has a higher carbon content than standard 304, which improves its strength at high temperatures.
The H in SS 304H stands for High Carbon. ASTM A403 WP304H specifies a controlled carbon range of 0.04% minimum to 0.10% maximum, which provides significantly better creep and stress-rupture strength at elevated temperatures above 550°C compared to standard 304.
Yes, SS 304H is specially designed for high-temperature service such as boilers, heat exchangers, and refineries.
Yes, SS 304H offers good weldability, but post-weld heat treatment may be recommended for thicker sections.
The melting point of Stainless Steel 304H is approximately 1400°C to 1450°C.
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