Annealing-free two-phase steel wire rod for pressure container and production method thereof
A technology of pressure vessel and production method, which is applied in the field of steel rolling, and can solve the problems of high cost, unclean removal of primary scale, and difficulty in removing phosphorus from steel billets, etc.
Active Publication Date: 2018-12-21
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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Problems solved by technology
However, in this production process, the temperature of the soaking section of billet heating is as high as 1120-1200°C. For welding wire steel with a Si content of 0.4-0.6%, the heating temperature is higher than that of Fe 2 SiO 4 At the melting point of 1173°C, liquid Fe 2 SiO 4 The intrusion into the matrix increases the difficulty of phosphorus removal before the subsequent steel billet rolling, resulting in unclean removal of the primary scale, which ultimately affects the pickling effect of the wire rod, the surface quality of the finished welding wire and the welding performance
[0004] Patent CN103060676A discloses a kind of annealing-free wire rod for high-strength nuts and its production method, but the final rolling temperature and spinning temperature of this method are low, which is not conducive to the welding wire steel with high ferrite transformation temperature in the heat preservation cover. Internal slow cooling phase transformation, this process is only suitable for carbon steel with low phase transformation temperature
Patent CN104668820A discloses a production method of heat-resistant steel welding wire, but the wire rod needs to undergo an intermediate annealing before it can be made into welding wire, and the cost is still high
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[0034] Below in conjunction with embodiment further illustrate the present invention:
[0035] A 100t electric furnace was used for smelting and casting into a 140mm×140mm billet. The chemical composition of the billet is shown in Table 1. The smelted steel billet is made into Φ5.5mm wire rod through billet heating, controlled rolling and Stelmore slow cold rolling on the Morgan high-speed wire rod production line. The key rolling process parameters are shown in Table 2. The test results and performance of the finished wire rod are shown in Table 3.
[0036] The chemical composition (%, percent by weight) of billet of table 1
[0037] serial number
C
Si
mn
Cr
Mo
V
P
S
Nb
Ti
Al
Example 1
0.07
0.69
1.43
1.17
0.55
0.26
0.0070
0.012
0.021
-
0.0014
Example 2
0.09
0.75
1.55
1.14
0.62
0.31
0.0067
0.015
0.0053
0.012
-
Example 3
0.06
0.79
1.32...
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The invention discloses an annealing-free two-phase steel wire rod for a pressure container and a production method. The annealing-free two-phase steel wire rod is prepared from, by weight, 0.06-0.10%of C, 0.6-0.8% of Si, 1.3-1.6% of Mn, 1.0-1.2% of Cr, 0.50-0.65% of Mo, 0.20-0.35% of V, 0.015% or less of P, 0.005-0.018% of S and the balance Fe and inevitable impurities. The production method comprises the production working procedures of steel billet heating, rolling control and Stelmor slow cooling. The production process of the steel wire rod is controlled through rolling control and cooling control, the two-phase steel wire rod of a ferrite and low carbon martensite structure is obtained, the tensile strength of the steel wire rod is smaller than or equal to 720MPa, the ratio in percent by volume of low carbon martensite is 15%-25%, and the structure grain size is 10-11 grade. According to the steel wire rod produced through the method, downstream customers can achieve annealing-free drawing, and a positive effect is achieved for enterprises for saving energy and reducing consumption, controlling the production cost and improving the efficiency.
Description
technical field [0001] The invention belongs to the field of steel rolling, in particular to an annealing-free dual-phase steel wire rod for pressure vessels and a production method thereof. Background technique [0002] Cr-Mo-V series low-alloy heat-resistant steel welding solid wire is made by drawing hot-rolled wire rods. The wire rods produced by the prior art have higher strength and poor plasticity, and generally need to be drawn before or after drawing. annealing in the process. However, the annealing treatment not only has a long production cycle, but also high energy consumption. Due to the current environmental protection and cost pressures, downstream welding wire companies urgently need steel mills to develop annealing-free wire rods. [0003] Among the relevant literature technologies that have been published so far, the patent CN102513725A discloses an annealing-free welding wire steel wire rod and its production process, which controls the tensile strength of...
Claims
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Login to View More IPC IPC(8): C21D8/06C22C38/02C22C38/04C22C38/38C22C38/22C22C38/24C22C38/26C22C38/28C22C38/06
CPCC21D8/065C21D2211/005C21D2211/008C22C38/002C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26C22C38/28C22C38/38
Inventor郭慧英张宇麻晗
OwnerINST OF RES OF IRON & STEEL JIANGSU PROVINCE