Alloy pipes and fittings have excellent corrosion resistance and
high strength, and are widely used in industries such as petroleum,
chemical, power, and shipbuilding etc. The characteristics of alloy
steel elbows mainly include the following aspects:
- Firstly, alloy steel pipe fittings have good pressure resistance
and can withstand working conditions in high-pressure environments,
ensuring the safe operation of the pipeline system.
- Secondly, alloy steel pipe fittings have excellent corrosion
resistance, which can resist the erosion of acidic and alkaline
media, prolong service life, and reduce maintenance costs.
In addition, alloy steel pipe fittings have the characteristics of
good dimensional stability and easy installation, which can meet
the needs of different occasions and improve the efficiency of
engineering construction.
- Manufacturing process and working principle of alloy steel pipe
fittings
The manufacturing process of alloy steel pipe fittings usually
includes processes such as material preparation, forging or cold
stamping, and heat treatment. The working principle is to change
the direction of the pipeline to achieve fluid steering and
maintain the normal operation of the pipeline system.
A335 P91 not only has high oxidation resistance and
high-temperature steam corrosion resistance, but also has good
impact toughness, high and stable durability and thermal strength
performance. When the operating temperature is below 620 ℃, its
allowable stress is higher than that of austenitic stainless steel.
At temperatures above 550 ℃, the recommended design allowable
stress is about twice that of T9 and 2.25Cr-1Mo steel.
It can be used as steel pipes for high-temperature superheaters and
reheaters with wall temperatures ≤ 625 ℃ in subcritical and
supercritical boilers, as well as high-temperature headers and
steam pipelines with wall temperatures ≤ 600 ℃. It can also be used
as nuclear electric heat exchangers and furnace tubes in petroleum
cracking units.
Elongation rate: ≥ 20 (%)
Chemical composition of P91 steel wt%
C 0.08~0.12 Mn 0.30~0.60 Si 0.20~0.50 P ≤ 0.02 S ≤ 0.01 Cr 8.0~9.5
Mo 0.85~1.05 V 0.18~0.25 Nb 0.06~0.1 N 0.03~0.07 Al ≤ 0.04 Ni ≤ 0.4
- Alloy steel—Pipe fittings
Our company can produce carbon steel, stainless steel, and alloy
steel pipe fittings according to standards such as ASME/ANSI, JIS,
DIN, ISO etc. The varieties include equal diameter tees, reducing
tees, tees, elbows, cross, concentric reducer, eccentric reducer
etc. We provide the very best quality pipe and fittings, prompt
delivery and reliable services at competitive prices.
