ASTM A105 Threaded Fittings is a one type of forged carbon steel pipe fitting, which manufactured conform to standard of ASME B16.11 and BS 3799. The others are Threaded Nipple, Tee, Cross, Coupling, Cap, Union, Plug and Bushing.
Carbon Steel ASTM A105 Threaded Fittings
Carbon steel forged fittings are in large demand, and Grade ASTM A105 is the most popular. This alloy is forged at between 1,700 degrees Fahrenheit and 2,200 degrees Fahrenheit, followed by quenching and tempering. It contains Manganese and silicon which can improve the quality.
The composition of Carbon Steel ASTM A105 Threaded Fittings does not change, but the grains are refined. It is resistant to high temperatures and impacts, but have poor corrosion resistance. You can choose galvanized Elbow to prolong the services life.
Class 3000 Threaded Fittings
3000LB threaded fittings are extensive used in heating, water and gas pipeline and dismantle demanded pipelines with low pressure. Their application are limited by following conditions:
1. The thread should be tapered. All fittings with internal and external threads shall be threaded with American National Standard Taper Pipe Threads (ASME B1.20.1). It is not recommended to use threaded fittings when the temperature is lower than -45℃ or higher than 200℃.
2. Toxic medium pipeline should be avoided.
3. Pipes with vibrations and excessive temperature changes should be avoided.
4. Compare with welded fittings, the seal of threaded fittings are less strong. That’s why it usually accompanied with sealant.
What is ASTM A105?
ASTM A105 is most commonly used carbon steel material grade that used to manufacture forged fittings of small diameter and forged steel flanges which below 24 inch. This carbon steel material grade is used for ambient- and higher-temperature service in pressure systems.
Tolerance for ASTM A105 Threaded Fittings
What is Female NPT?
NPT and BSP are the most common threads for threaded fittings. NPT female thread is an internal tapered threads with 60 degree angle. The thread taper is 1:16, size range is 1/16” to 12”.
According to the standard, all internal threads shall be countersunk a distance not less than one-half the pitch of the thread at an angle of approximately 45 deg with the axis of the thread. Countersinking shall be concentric with the threads. The length of threads shall be measured to include the countersink.