What does the H stand for in 304H?
High” carbon content
The “H” in 304H stands for “High” carbon content. 304H must contain not less than 0.04 percent carbon, nor more than 0.10 percent. The higher carbon content of 304H increases its strength, so the ASTM tensile and yield strength of 304H is greater than 304L.
How are pipe fittings classified?
Pipe fittings are generally classified as “welded” or “pressure” fittings. Welded fittings are welded on to the piping system where as pressure fitting uses National Pipe Thread (NPT) to connect to the pipe. Pressure fittings are classified as 3000#, 6000# or 9000# (most common).
What is the difference between 304 and 304H?
304L has a maximum of 0.3% carbon and 304H has between 0.04 and 0.1% carbon which affords it a better strength at higher temperatures. 304H has significantly higher strength at increased temperatures meaning it is frequently selected when both high-temperature resistance and corrosion resistance are necessary.
What does the L mean in stainless steel?
316/316L Stainless Steel: The ‘L’ Designation The L denotes the low content of carbon in the steel. 316L is best known among fabricators for being resistant to cracks after the weld process is completed. This makes 316L the preferred choice of fabricators who look to build metallic structures for industry applications.
Who invented pipe threads?
Sir Joseph Whitworth, the English mechanical engineer and inventor, devised a uniform threading system in 1841 to address the incompatibility problem. The Whitworth thread form is based on a 55 degree thread angle with rounded roots and crests.
How do I choose a pipe class?
Pipes and Pipe Class Generally, pipes are categorized based on their manufacturing method, which are mainly either welded or seamless. Welded pipes are preferred if large-diameter pipes are needed, while seamless ones work for projects that require small or medium pipes.
What is 304H stainless steel?
Alloy 304/304H (UNS S30400/ S30409) is a modification of the most widely utilized “18-8” chromium-nickel austenitic stainless steel. It is an economical and versatile corrosion resistant alloy suitable for a wide range of general purpose applications. It is common practice for 304H to be dual certified as 304 and 304H.
What is ss304h?
It is an austenitic chromium-nickel steel alloy and the greater carbon content delivers an increased tensile and yield strength. The material is recommended for use in ASME pressure vessels in working service above 525° C due to the grade’s heat resistant properties.
What is the difference between SUS316 and SUS316L?
SUS316 is stainless steel contained Chrome 18% & Nickel 12%, and added Molybdenum for increasing corrosion resistance. SUS316L is super low carbon steel content of carbon equal to below 0.03%, and improved performanceof SUS316.
What does NPT stand for in piping?
American National Pipe Tapered Thread
The best known and most widely used connection where the pipe thread provides both the mechanical joint and the hydraulic seal is the American National Pipe Tapered Thread, or NPT. NPT has a tapered male and female thread which seals with Teflon tape or jointing compound.
What size pipe has more threads per inch?
How many threads per Inch does National Pipe Thread have?
| Pipe Size (inches) | Threads per inch TPI – pitch | Outside Diameter OD (inches) |
|---|---|---|
| 3-1/2” | 8 | 4.00” |
| 4” | 8 | 4.500” |
| 5” | 8 | 5.563” |
| 6” | 8 | 6.625” |