Thick-wall low-cost X65 hot rolled coil for spiral welded tubing and manufacture method thereof
A technology of a spiral welded pipe and a manufacturing method, which is applied in the field of thick-walled pipeline steel hot-rolled coil for spiral submerged arc welded pipe and its manufacturing, can solve the problem of high alloy cost and achieve the effect of saving alloy cost
Active Publication Date: 2015-06-03
ANGANG STEEL CO LTD
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Problems solved by technology
[0009] The purpose of the present invention is to provide a thick-walled low-cost X65 hot-rolled coil for spiral welded pipe and its manufacturing method, which solves the problem of high alloy cost by replacing precious elements Ni, Mo, Cu, etc. with a small amount of Cr and V, and has high strength and good weldability
Method used
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[0029] Examples of the present invention are listed below. The chemical composition of the test steel is shown in Table 1, the heating, rolling and cooling process is shown in Table 2, and the mechanical properties are shown in Table 3.
[0030] Table 1 chemical composition (wt,%)
[0031] Example
C
Si
mn
P
S
Nb
V
Ti
Cr
als
N
Ceq
Pcm
1
0.05
0.15
1.56
0.010
0.002
0.05
0.03
0.018
0.10
0.02
0.004
0.34
0.14
2
0.06
0.16
1.62
0.014
0.002
0.05
0.04
0.014
0.15
0.02
0.003
0.37
0.16
3
0.06
0.22
1.55
0.016
0.006
0.05
0.05
0.014
0.14
0.03
0.003
0.36
0.16
4
0.07
0.16
1.56
0.014
0.003
0.05
0.04
0.012
0....
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Abstract
The invention discloses thick-wall low-cost X65 hot rolled coil for spiral welded tubing and manufacture method thereof. The chemical components of the coil comprise C 0.05-0.10%, Si 0.10-0.30%, Mn 1.50-1.65%, P less than or equal to 0.020%, S less than or equal to 0.008%, Ti 0.008-0.020%, Als 0.02-0.06%, Nb 0.04-0.07%, Cr 0.10-0.20%, V 0.03-0.06%, N less than or equal to 0.008%, and Fe and unavoidable impurity in balance; wherein Ceq is less than or equal to 0.40%, and Pcm is less than or equal to 0.21%. The method includes heating continuous cast slabs to 1,180-1300 DEG C. via a heating furnace; performing two-stage controlled rolling, wherein the first stage initial rolling temperature is 1,120-1,220 DEG C., final temperature is greater than 960 DEG C., the second-stage initial rolling temperature is less than 1,020 DEG C., final rolling temperature is 780-850 DEG C., and the second-stage accumulated deformation amount is greater than 60%; cooling the coil after rolling with a cooling speed of 5-11 DEG C. / s; and performing coiling at 510-570 DEG C.. The invention saves alloy cost, and has high strength, good welding property, good tear resistance, good erosion resistance, and high safety.
Description
technical field [0001] The present invention relates to the manufacture of a pipeline steel hot-rolled coil for oil and gas transportation pipelines, in particular to a thick-walled (16-21mm) pipeline steel hot-rolled coil for spiral submerged arc welded pipe (SSAW) in APISPEC 5L and its manufacturing method , the strength of the coil is X65 steel grade in API Spec 5L standard. Background technique [0002] Oil is the main energy source for industrial development, and oil pipeline transportation has the characteristics of high efficiency, safety, and economy. In order to reduce the cost of oil pipeline transportation, oil transportation pipelines tend to develop in the direction of large diameter, high pressure and thick wall. In order to ensure the stability and safety of pipeline transportation, long-distance, high-pressure pipelines require pipeline steel with sufficient strength and wall thickness to ensure safety. When the strength is constant, increasing the wall thic...
Claims
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IPC IPC(8): C22C38/38C22C33/04C21D8/02
Inventor 黄明浩黄国建徐烽张禄林张英慧孔祥磊
Owner ANGANG STEEL CO LTD