ASTM A312 Gr Tp304h is a high carbon version of the Tp304 material. It is an austenitic stainless steel stabilized with titanium for better strength and corrosion resistance properties.
The ASTM A312 Tp 304h material also has small amounts of molybdenum, nitrogen, niobium and other elements. The main components of ASTM A312 304h are the carbon, manganese, phosphorus, sulfur, silicon and chromium.
Our A312 304h products come in different types, shapes and sizes. We produce A312 Tp304h pipes for high temperature services with high toughness. The wear and tear resistance of the SA312 Tp304h material is high because of the high carbon content.
| ASTM Specifications | ASTM A312 / ASTM SA312 |
| Dimensional ASME Specifications | ANSI/ASME B36.19M, ANSI/ASME B36.10M |
| Different Types and Forms | Round, Honed, Rectangle, Hydraulic, Hex, Square |
| Common types | Welded, CDW, Fabricated, 100% X Ray Welded, ERW, Seamless |
| Pipe End Abbreviations | Beveled end, Treaded Both Ends, Treaded On End, Bevel large end, Plain Both Ends, Beveled One End, Plain One End, Bevel small end, Bevel one end, Bevel both ends |
| Grade and Delivery Condition | Bright Annealed, Polished, Cold Drawn, Annealed and Pickled |
| Surface Finish Types | 2B, No.4, No.1, No.8 Mirror Finish or custom Finish as per customer Requirements |
| Thickness Range | SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS |
| Full Range of Value-Added Services | Ultrasonic Testing, Machining, Threading, Non Destructive, Beveling, Customer Tagging/ Marking, Destructive, MTR’s Available, Grooving, Export Documentation, Cutting, Polishing, Export Packaging, Material testing, Color Coding, Threading |
| Marking |
Marked Pipe Sample: ANSI B36.19 ASTM A312 TP304H 12" NB SCH 40S SEAMLESS HEAT NO. XXXX |
What does the H mean in 304h pipes?
Stainless steel is one of the most used materials in the world for various purposes and the 304 grade of steel is the most common of them. The grade 304 is a chromium nickel austenitic stainless steel that has mild corrosion resistance, good strength and good wear and tear properties. There are times when the properties have to be better without going to another grade of steel.
At requirements like this, the material is altered by altering the chemical composition. In case of the grade 304, the carbon content could be altered to bring less chromium carbide precipitation while welding or the carbon content could be increased to bring more toughness and wear and tear resistance. The high carbon content material is called the 304H, whereas the low carbon variation is called the 304L.
So, the H in the 304H means it has high carbon content. The same applies for many other grades of stainless steels as well. The high carbon version also does not have a 0.1% nitrogen limit in their composition opposed to the lower carbon versions. Also the high carbon versions should maintain an ASTM no 7 grain size to comply with the standards.
| SS UNS S30409 Seamless Pipe | SA 312 TP 304H Round Pipe |
| ASTM A 312 TP 304H Stainless Steel Exhaust Pipe | A312 TP 304H Electropolished Pipe |
| ASTM A312 GR TP304H Schedule 40 Pipe | TP 304H Stainless Steel Threaded Pipe |
| A312 Stainless Steel 304H 3 Inch Pipe | ASTM A312 TP304H Water Pipe |
| Austenitic Stainless Steel 304H Square Pipe Price | A312 TP304H Rectangular Pipe |
| Werkstoff nr. 1.4301 Stainless Steel 304H Hollow Pipe | TP 304H Stainless Steel DIN 1.4301 Box Pipe |
| Stainless Steel UNS S30409 Schedule 80 Pipe | ASTM A312 SS 304H C Class Pipe |
| A312 GR TP304H Schedule 10 Pipe | SA312 304H Stainless Steel Dairy Pipe |
| ASTM A312 TP304H Polished Pipe | TP 304H Stainless Steel Erw Pipe |
| SUS | Tensile Strength minimum (MPa) | Yield Strength 0.2% Proof minimum (MPa) | Elongation minimum (% in 50mm) | Hardness | |
| Rockwell B (HR B) maximum | Brinell (HB) maximum | ||||
| 304H | 515 | 205 | 40 | 92 | 201 |
| ASTM A312 | Si | C | Mn | P | S | Cr | Mo | Ni | N | |
| 304H | min. | - | - | - | - | - | 18.0 | - | 8.0 | - |
| max. | 0.75 | 0.10 | 2.0 | 0.045 | 0.03 | 20.0 | 10.5 | - | ||
| GRADE | UNS | WERKSTOFF NR. | JIS | AFNOR | BS | GOST | EN | SS |
| USA | GERMAN | JAPAN | RUSSIAN | BRITISH | RUSSIAN | EUROPE | SWEDISH | |
| ASTM A312 304H | S30409 | 1.4948 | SUS 304H | - | 304S11 | - | X5CrNi18-10 | 2332 |
Hebei Shengtian Pipe Fittings Group Co., Ltd. is a manufacturer and supplier of ASTM SA312 304H Seamless Stainless Steel Pipe type. 304h seamless container tubes are mainly used in refineries, natural gas industries, pressure vessels, boilers and thermal power plant components, etc. Stainless steel 304h welded pipe is stronger than ordinary tp304 pipe and can be used in condensers and other pipes with higher strength requirements. Our SS 304h round tube is the most commonly used shape, but we also produce square tubes and hexagonal tubes to meet customer needs.
