K55-grade high frequency resistance welding oil casting steel and its manufacturing method
A technology of high-frequency resistance welding and petroleum casing, applied in the direction of temperature control, etc., can solve the problems of complicated welding process, high alloy cost, high production cost of steel pipe, etc., and achieve the effect of simple heat treatment process, good impact toughness and saving alloy cost
Active Publication Date: 2014-12-31
ANGANG STEEL CO LTD
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Problems solved by technology
[0008] From the above published documents, the prior art C content is relatively high, the weldability and impact toughness of the steel strip are average, the welding process is complicated, and the production efficiency of the pipe is low; some need to add the precious alloy element Mo, and the alloy cost is relatively high; Some require heat treatment of the whole tube, the heat treatment process is complicated, and the production cost of the steel tube is high
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[0026] The present invention will be further described below by way of examples.
[0027] The chemical composition of the steel in the embodiment of the present invention is shown in Table 1, the heating, rolling and cooling processes are shown in Table 2, and the mechanical properties are shown in Table 3.
[0028] Table 1 Chemical composition (wt, %) of steel of embodiment of the present invention
[0029] Example
C
Si
mn
P
S
Nb
V
Ti
Cr
als
N
1
0.055
0.30
1.83
0.014
0.003
0.065
0.04
0.05
0.31
0.05
0.005
2
0.094
0.28
1.67
0.011
0.004
0.070
0.03
0.03
0.26
0.02
0.004
3
0.073
0.30
1.51
0.015
0.008
0.072
0.03
0.03
0.26
0.04
0.005
4
0.078
0.22
1.61
0.010
0.00...
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Abstract
The invention provides K55-grade high frequency resistance welding oil casting steel and its manufacturing method. The steel provided by the invention comprises the following chemical components of: by weight, 0.055-0.095% of C, 0.15-0.30% of Si, 1.50-1.85% of Mn, P being less than or equal to 0.020%, S being less than or equal to 0.008%, 0.010-0.050% of Ti, 0.02-0.06% of Als, 0.04-0.07% of Nb, 0.23-0.31% of Cr, 0.01-0.04% of V, N being less than or equal to 0.008%, and the balance Fe. The method provided by the invention comprises smelting, continuous casting and rolling technologies. A continuous casting slab is heated to 1200-1300 DEG C and undergoes two-stage controlled rolling. During the first stage, rolling temperature is 1100-1200 DEG C, and finishing temperature is greater than 980 DEG C; and during the second stage, rolling temperature is less than 960 DEG C and finishing temperature is 820-880 DEG C. After rolling, the continuous casting slab is cooled to 770-810 DEG C at the cooling rate of 3-6 DEG C / s and is then rapidly cooled at the cooling rate of 10-15 DEG C / s. The reeling temperature is 570-630 DEG C. The K55-grade high frequency resistance welding oil casting steel provided by the invention has advantages of low C content, excellent weldability, good impact toughness, low alloy cost and simple production technology.
Description
technical field [0001] The present invention relates to a kind of steel technology for HFW (High frequency electric-resistance-weld, high frequency resistance welding) bushing, in particular to a steel with excellent weldability and impact toughness (-10°C, transverse >100J) in API SPEC 5CT Low yield strength ratio K55 steel grade oil casing steel and its manufacturing method. Background technique [0002] Oil casing is one of the most commonly used petroleum-specific pipes in oil fields. It consumes a lot of money and costs a lot. It is an indispensable construction material in oil and gas field drilling operations. Compared with seamless pipes, HFW casings have significant advantages such as uniform wall thickness, high dimensional accuracy, good perforation performance, strong collapse resistance, and low cost, and are gradually replacing traditional seamless steel pipes. [0003] API Spec 5CT stipulates: the yield strength of K55 steel pipe is between 379-552MPa, the...
Claims
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IPC IPC(8): C22C38/38C22C38/26C21D8/02B21B37/74
Inventor 黄明浩黄国建张禄林张英慧孔祥磊徐烽
Owner ANGANG STEEL CO LTD