Process properties of GH4037 alloy seamless pipes.
1.Melting and casting.
GH4037 alloy can be smelted by vacuum induction furnace melting or vacuum induction furnace melting plus electroslag remelting. In order to ensure the purity of the alloy, the composition and impurity content of the raw materials should be strictly controlled during the smelting process. By adopting reasonable casting processes, such as directional solidification, heat sink, etc., castings with no cracks and dense structure can be obtained.
2.Heat treatment.
During the heat treatment process of GH4037 alloy seamless tube, the heating temperature and cooling rate should be controlled to obtain the ideal phase composition and grain size. Usually two stages, solution treatment and aging treatment, are used to control the strength and toughness of the alloy by adjusting the treatment parameters.
3.Cold working and forming.
In the process of processing, GH4037 alloy seamless pipe can be shaped by cold drawing, cold rolling and other processes. During the processing process, the amount of deformation should be controlled to avoid defects such as cracks. At the same time, in order to improve the strength and corrosion resistance of the pipe, appropriate heat treatment can be carried out.
4.Soldering & Joining.
GH4037 alloy seamless pipe can be welded by tungsten argon arc welding, laser welding and other methods. Pre-heat treatment should be carried out before welding, and heat treatment should be carried out after welding to relieve stress. At the same time, brazing, friction welding, and other methods can be used for connection.
GH4037 chemical composition
c0.03～0.10
cr13.00～16.00
Ni Yu. w5.00～7.00
mo2.00～4.00
al1.70～2.30
ti1.80～2.30
fe≤5.00
v0.100～0.500
b≤0.020
ce≤0.020
mn≤0.50
si≤0.40
p≤0.015
s≤0.010
cu≤0.070
pb≤0.001
GH4037 Production Implementation Standard:
Standard Chemical Composition: Bars, Forgings, Plates, Wires, Tubes.
National Standard GB T14992 GB T14994
gb/t14993 gb/t14997
gb/t14998 gb/t14995
gb/t14996 yb/t5249 gb/t15062
Aviation Industry Standard HB5189
National Military Standard GJB1953
GH4037 Metallographic Structure:
The structure of the alloy in the standard heat treated state is austenitic matrix and diffuse precipitation'In the phase, there are a small amount of M23C6 and M6C type carbides in the grain boundaries, and there are massive MC type carbides in the crystals.
GH4037 process performance and requirements:
1. The alloy has good malleability, with a forging heating temperature of 1140 and a final forging temperature of 1100.
The average grain size of the alloy is closely related to the deformation degree of the forging and the final forging temperature.