There are many types of titanium alloys, so the processing technology and methods of titanium pipes are different, and there are many factors that affect the quality of the pipes. The main influencing factors and control measures are listed below.
1. Alloy quality:
Problem Description:
High-density inclusions, segregation, or brittle and hard phases are formed, resulting in uneven pipe forming, and cracks or even cracks during pipe preparation.
Control measures:
1. Use multiple vacuum consumable smelting.
2. Reduce the melting current to slow down the melting speed.
3. Use a good electron beam cooling bed furnace for smelting.
2. The quality of tube blank:
Problem Description:
1. Extruded titanium pipe billet has small structure and good plasticity, but the equipment is complicated and the investment is large;
2. The slanting-rolled and pierced billet has a coarser structure, poor plasticity and good surface quality.
Control measures:
1. Extrusion Ding Yi is suitable for the production of titanium pipes with low strength and high dimensional accuracy.
2. The cross-rolling piercing process is suitable for the production of titanium tube blanks with higher strength and fixed specifications and larger batches.
3. Heat treatment system:
Problem Description:
Too high temperature will lead to coarse structure, too low will lead to under-annealing, residual stress and work hardening cannot be eliminated, which will affect subsequent processing and finished product performance.
Control measures:
1. Accurately determine the alloy phase transition point for each batch of materials.
2. Develop a reasonable heat treatment process based on the pipe plus T path and the alloy mechanical properties.
3. Strictly control the heat treatment atmosphere.
4. Deformation:
Problem Description:
1. Excessive deformation of the titanium pipe will lead to poor surface quality, cracks, cracks, etc.
2. If the deformation is small, the coarse original crystal grains cannot be broken, the mechanical properties of the pipe are low, and the production efficiency is low.
Control measures:
1. Arrange the processing passes reasonably according to the allowable pass deformation and the larger accumulated deformation.
2. Pay attention to the matching of Q value and deformation to make the pipe produce beneficial texture orientation.
5. Lubrication process:
Problem Description:
High-efficiency lubricants can reduce plastic forming resistance, maintain pipe surface quality, prevent local overheating, and reduce tool and die wear.
Control measures:
1. Consider the forming process of the titanium pipe, and select the appropriate lubricant according to the characteristics of the alloy.
2. Analyze the dissection process and accurately design the combined lubricant.
Contact Us
Baoji Jufuti Non-ferrous Metals co,Ltd.
Email: sales1@bjjfti.com
Telephone: +86 917-3158689
Mobile: +86 13892777995
Address: Gaoya Industrial Park, Gaoya village, Bayu Town, high-tech Development Zone, Baoji City, Shaanxi Province，China.
