CN104789861B - A kind of high intensity steel plate of resistance to molten zinc corrosion and manufacture method thereof - Google Patents

A kind of high intensity steel plate of resistance to molten zinc corrosion and manufacture method thereof Download PDF

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CN104789861B
CN104789861B CN201510231231.8A CN201510231231A CN104789861B CN 104789861 B CN104789861 B CN 104789861B CN 201510231231 A CN201510231231 A CN 201510231231A CN 104789861 B CN104789861 B CN 104789861B
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steel plate
resistance
molten zinc
high intensity
zinc corrosion
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CN104789861A (en
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周兰聚
侯登义
冯勇
侯东华
贾慧领
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Shandong Iron and Steel Group Co Ltd SISG
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Shandong Iron and Steel Group Co Ltd SISG
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Abstract

The present invention relates to a kind of high intensity steel plate of resistance to molten zinc corrosion and manufacture method thereof, its melting chemical composition is by mass percentage: C≤0.02%;Si≤0.02%;Mn≤0.25%;P≤0.010%;S≤0.001%;Alt≤0.050%;Remaining is Fe and inevitable impurity.Committed step in manufacture method quickly cools down after being RH intensive conch, sheet slab low frequency big amplitude continuous casting and rolling.The present invention is carbon, silicon, big substance that Fe content is lower, big cross section continuous casting steel billet, and utilize roll after quickly cooling ensure that steel plate can cool down uniformly.The high intensity steel plate of resistance to molten zinc corrosion that the present invention produces, the zinc pot manufacture being mainly used in galvanizing industry, its tensile strength > 500MPa, elongation percentage > 35%, 20 DEG C of low-temperature impact work > 200J, in year molten zinc corrosion speed < 0.08mm, I grade of ultrasonic examination of JB/T4730.3 of the present invention is qualified.

Description

A kind of high intensity steel plate of resistance to molten zinc corrosion and manufacture method thereof
Technical field
The invention belongs to anti-corrosion steel plate and manufacture field, relate to a kind of high intensity steel plate of resistance to molten zinc corrosion and manufacturer thereof Method.
Background technology
The consumption per head of galvanizing production indicates the height of national living standards of the people, hot dip to a certain extent Zinc product is widely used in the every field of the national economy such as metallurgy, building materials, electric power, traffic.In hot dip galvanizing process, contain The container of zinc liquid is referred to as zinc pot, is mostly to be fabricated by by Plate Welding, and zinc liquid temperature is generally 440-480 DEG C, due to zinc liquid pair Steel zinc pot has strong corrosion, and therefore improving zinc pot corrosion resistance is current galvanizing industry question of common concern, uses " resistance to Molten zinc corrosion steel plate " manufacture zinc pot be one of current maximally effective approach.
Nearly 30 or 40 years, the metal material of resistance to molten zinc corrosion having carried out numerous studies both at home and abroad, Iron and Steel Research Geueral Inst exists 20 century 70s have developed a kind of anti-pot material Mo-30W sintered metal product melting zinc etch, has fabulous resistance to Molten zinc corrosion ability, the corrosion rate in the zinc liquid of 440 DEG C is only 0.051-0.152mm/a.Japan's Datong District's steel strain formula meeting Add the firm will of rattan etc. in W-Mo alloy, to add Re, Ti unit usually improve hot-working character, although this material has the resistance to of excellence Corrosion type, but with high costs, bad mechanical property, it is not used widely.Domestic existing hot-galvanized cauldron typically uses relatively The Fine Steel Casting iron plates such as thick 05F, 08F are welded, and Anshan iron and steel plant more already develops XG05, XG08 cut deal, the most at home Having bigger market share, the common feature of these products is low-carbon (LC), low silicon, the design of low manganese composition, and carbon content is generally less than 0.09%, silicone content is less than 0.04%, and Fe content is between 0.30 ~ 0.60%, and the condition of delivery of steel plate is all rolled, this type of steel Plate has a preferable resistance to molten zinc corrosion, but low cross-intensity, the most all at about 300MPa, the zinc pot made easily becomes Shape, impact uses and there is bigger potential safety hazard, then needing to seek superior technique measure further to eliminate above-mentioned fraud End, as Chinese patent CN01128476.5 discloses a kind of Large Heat Input Welding high-toughness steel for resisting corrosion of molten zinc and producer thereof Method, uses the controlled rolling condition of delivery, utilizes the composite oxides of Ti to obtain anti-large-line energy (>=50kJ/cm) welding performance, Nb, V microalloying improves intensity, adds the precious alloys such as Cu, Ni, B, RE and improves resisting zinc liquid corrosion performance, though this method energy Taking into account resistance to molten zinc corrosion and high-strength tenacity, but manufacturing cost is too high, wlding is difficult to coupling, answers so rare to market widely With.
Summary of the invention
For deficiency of the prior art, the invention provides a kind of high intensity steel plate of resistance to molten zinc corrosion and manufacturer thereof Method.The present invention uses lower carbon, silicon, Fe content, without alloying element, produces low cost, intensity is high, plasticity is good, low The high-strength steel sheet of the resistance to molten zinc corrosion of temperature good-toughness.Technical scheme is as follows:
A kind of high intensity steel plate of resistance to molten zinc corrosion, its melting chemical composition is by mass percentage: C≤0.02%;Si≤ 0.02%;Mn≤0.25%;P≤0.010%;S≤0.001%;Alt≤0.050%;Remaining is Fe and inevitable impurity.
The manufacture method of the present invention, process route is as follows:
KR molten iron pretreatment → converter smelting → deoxidation alloying → CAS refine → LF refine → RH intensive conch → big plate Base low frequency big amplitude continuous casting → strand cuts → rolls off the production line slow cooling more than 48 hours → checks that cleaning → heating of plate blank → water under high pressure removes Squama → Stand Mill quickly cools down → aligning after rolling → rolling.
Further, described RH intensive conch: vacuum: 5.0-6.0 mbar, evacuation processes time: 50-60min, Mixing time: 30-40min, soft blow time: 50-60min.
Further, described sheet slab low frequency big amplitude continuous casting: slab thickness scope: 250mm-500mm, width of plate slab model Enclosing: 1820-3500mm, casting speed: 0.40-0.50m/min, crystallizer vibration amplitude: 8-12mm, shake frequency: 80-90 beat/min, knot Brilliant device advanced argument scope: 8-12mm.
Further, quickly cooling after rolling described in: rate of cooling: 35-40 DEG C/s, the final cooling temperature temperature difference: table on steel plate Face, lower surface and steel plate center maximum temperature difference: 0-10 DEG C.
In the present invention, when the high intensity steel plate thickness of resistance to molten zinc corrosion is 50mm, the melting chemical composition of steel plate presses quality hundred Proportion by subtraction is: C:0.02%, Si:0.02%, Mn:0.22%, P:0.008%, S:0.0008%, Alt: 0.035%, and remaining is Fe and not Evitable impurity.
In preparation process:
(1) RH intensive conch: vacuum: 5.2mbar, evacuation processes time: 55min, mixing time: 30min, soft blow Time: 50min;
(2) sheet slab low frequency big amplitude continuous casting: slab thickness: 250mm, width: 1820mm, casting speed: 0.45m/ min;Crystallizer vibration amplitude: 10mm, shake frequency: 86 beats/min, crystallizer advanced argument: 8mm;
(3) quickly cooling after rolling: rate of cooling: 37 DEG C/s, the final cooling temperature temperature difference: upper surface of steel plate, lower surface and steel plate Center maximum temperature difference: 8 DEG C.
When the high intensity steel plate thickness of resistance to molten zinc corrosion is 60mm, the melting chemical composition of steel plate is by mass percentage: C: 0.01%, Si:0.01%, Mn:0.18%, P:0.007%, S:0.0003%, Alt: 0.038%, remaining is Fe and the most miscellaneous Matter.
In preparation process:
(1) RH intensive conch: vacuum: 5.0mbar, evacuation processes time: 59min, mixing time: 38min, soft blow Time: 52min;
(2) sheet slab low frequency big amplitude continuous casting: slab thickness: 300mm, width: 2500mm, casting speed: 0.40m/ min;Crystallizer vibration amplitude: 12mm, shake frequency: 80 beats/min, crystallizer advanced argument: 8mm;
(3) quickly cooling after rolling: rate of cooling: 39 DEG C/s, the final cooling temperature temperature difference: upper surface of steel plate, lower surface and steel plate Center maximum temperature difference: 7 DEG C.
When the high intensity steel plate thickness of resistance to molten zinc corrosion is 80mm, the melting chemical composition of steel plate is by mass percentage: C: 0.01%, Si:0.01%, Mn:0.20%, P:0.009%, S:0.001%, Alt: 0.045%, remaining is Fe and the most miscellaneous Matter.
In preparation process:
(1) RH intensive conch: vacuum: 5.5mbar, evacuation processes time: 60min, mixing time: 40min, soft blow Time: 55min;
(2) sheet slab low frequency big amplitude continuous casting: slab thickness: 400mm, width: 3000mm, casting speed: 0.40m/ min;Crystallizer vibration amplitude: 12mm, shake frequency: 85 beats/min, crystallizer advanced argument: 10mm;
(3) quickly cooling after rolling: rate of cooling: 40 DEG C/s, the final cooling temperature temperature difference: upper surface of steel plate, lower surface and steel plate Center maximum temperature difference: 3 DEG C.
When the high intensity steel plate thickness of resistance to molten zinc corrosion scope is 100mm, the melting chemical composition of steel plate is by mass percentage For: C:0.02%, Si:0.01%, Mn:0.21%, P:0.009%, S:0.0007%, Alt: 0.045%, remaining is for Fe and can not keep away The impurity exempted from.
In preparation process:
(1) RH intensive conch: vacuum: 6.0mbar, evacuation processes time: 50min, mixing time: 35min, soft blow Time: 60min;
(2) sheet slab low frequency big amplitude continuous casting: slab thickness: 500mm, width: 3500mm;Casting speed: 0.40m/ min;Crystallizer vibration amplitude: 9mm, shake frequency: 90 beats/min, crystallizer advanced argument: 11mm;
(3) quickly cooling after rolling: rate of cooling: 35 DEG C/s, the final cooling temperature temperature difference: upper surface of steel plate, lower surface and steel plate Center maximum temperature difference: 10 DEG C.
The high intensity steel plate thickness of resistance to molten zinc corrosion scope prepared by the present invention is 50-100mm.
Compared with prior art, key breakthrough of the present invention two big critical technological points, one is to produce carbon, silicon, Fe content more Low big substance, big cross section continuous casting steel billet, without material deoxidizer during smelting, only with aluminium deoxidation, molten steel is the most viscous Knot, smelts big with continuous casting difficulty, and the present invention uses the degassing of RH intensive conch circulating vacuum to avoid molten steel to return silicon, is precisely controlled to Point, deep desulfuration, remove in steel and be mingled with, it is ensured that steel plate inspection is qualified;For avoiding molten steel bonding to cause bleed-out, continuous casting process uses Tapering crystallizer continuously, uses non-sinusoidal oscillation mode, and vibration parameters uses low frequency high amplitude, it is ensured that negative slip amount, controls super Front amount;Another difficult point is that after utilization is rolled, quickly cooling makes crystal grain refine, and improves armor plate strength and toughness, it is necessary to assure 50-100mm The steel plate of thickness range can cool down uniformly, and same upper surface of steel plate, lower surface and steel plate center final cooling temperature maximum temperature Difference is less than 10 DEG C.
The high intensity steel plate of resistance to molten zinc corrosion of the present invention, the excellent performance of resistance to molten zinc corrosion, year molten zinc corrosion speed < 0.08mm.Tensile strength > 500MPa, elongation percentage > 35%, I grade of ultrasound wave of-20 DEG C of low-temperature impact work > 200J, JB/T4730.3 Detect a flaw qualified.Both there is preferable intensity, plasticity, had again good toughness, be widely used in and be easily worked shaping, required higher The steel zinc pot of intensity manufactures.
Accompanying drawing explanation
Fig. 1 is the metallographic structure figure of the high intensity steel plate of resistance to molten zinc corrosion using embodiment 1 preparation;
Fig. 2 is the metallographic structure figure of the high intensity steel plate of resistance to molten zinc corrosion using embodiment 2 preparation;
Fig. 3 is the metallographic structure figure of the high intensity steel plate of resistance to molten zinc corrosion using embodiment 3 preparation;
Fig. 4 is the metallographic structure figure of the high intensity steel plate of resistance to molten zinc corrosion using embodiment 4 preparation.
Detailed description of the invention
Below in conjunction with specific embodiment further describe the present invention, advantages of the present invention and feature will be with describe and Apparent.But embodiment is only exemplary, the scope of the present invention is not constituted any restriction.Those skilled in the art should It should be appreciated that, the details of technical solution of the present invention and form can be repaiied lower without departing from the spirit and scope of the present invention Change or replace, but these amendments and replacement each fall within protection scope of the present invention.
The manufacture method of the present invention, process route is as follows:
KR molten iron pretreatment → converter smelting → deoxidation alloying → CAS refine → LF refine → RH intensive conch → big plate Base low frequency big amplitude continuous casting → strand cuts → rolls off the production line slow cooling more than 48 hours → checks that cleaning → heating of plate blank → water under high pressure removes Squama → Stand Mill quickly cools down → aligning after rolling → rolling.
Embodiment 1 thickness is the high intensity steel plate of resistance to molten zinc corrosion of 50mm
Steel plate thickness: 50mm, the melting chemical composition of steel plate is by mass percentage: C:0.02%, Si:0.02%, Mn: 0.22%, P:0.008%, S:0.0008%, Alt: 0.035%, remaining is Fe and inevitable impurity.
Prepare the concrete committed step of above-mentioned steel plate and key parameter be as follows:
(1) RH intensive conch: vacuum: 5.2mbar, evacuation processes time: 55min, mixing time: 30min, soft blow Time: 50min;
(2) sheet slab low frequency big amplitude continuous casting: slab thickness: 250mm, width: 1820mm, casting speed: 0.45m/ min;Crystallizer vibration amplitude: 10mm, shake frequency: 86 beats/min, crystallizer advanced argument: 8mm;
(3) quickly cooling after rolling: rate of cooling: 37 DEG C/s, the final cooling temperature temperature difference: upper surface of steel plate, lower surface and steel plate Center maximum temperature difference: 8 DEG C.
The metallographic structure figure of the high intensity steel plate of resistance to molten zinc corrosion prepared by the present embodiment is as shown in Figure 1.
Embodiment 2 thickness is the high intensity steel plate of resistance to molten zinc corrosion of 60mm
Steel plate thickness: 60mm, the melting chemical composition of steel plate is by mass percentage: C:0.01%, Si:0.01%, Mn: 0.18%, P:0.007%, S:0.0003%, Alt: 0.038%, remaining is Fe and inevitable impurity.
Prepare the concrete committed step of above-mentioned steel plate and key parameter be as follows:
(1) RH intensive conch: vacuum: 5.0mbar, evacuation processes time: 59min, mixing time: 38min, soft blow Time: 52min;
(2) sheet slab low frequency big amplitude continuous casting: slab thickness: 300mm, width: 2500mm, casting speed: 0.40m/ min;Crystallizer vibration amplitude: 12mm, shake frequency: 80 beats/min, crystallizer advanced argument: 8mm;
(3) quickly cooling after rolling: rate of cooling: 39 DEG C/s, the final cooling temperature temperature difference: upper surface of steel plate, lower surface and steel plate Center maximum temperature difference: 7 DEG C.
The metallographic structure figure of the high intensity steel plate of resistance to molten zinc corrosion prepared by the present embodiment is as shown in Figure 2.
Embodiment 3 thickness is the high intensity steel plate of resistance to molten zinc corrosion of 80mm
Steel plate thickness: 80mm, the melting chemical composition of steel plate is by mass percentage: C:0.01%, Si:0.01%, Mn: 0.20%, P:0.009%, S:0.001%, Alt: 0.045%, remaining is Fe and inevitable impurity.
Prepare the concrete committed step of above-mentioned steel plate and key parameter be as follows:
(1) RH intensive conch: vacuum: 5.5mbar, evacuation processes time: 60min, mixing time: 40min, soft blow Time: 55min;
(2) sheet slab low frequency big amplitude continuous casting: slab thickness: 400mm, width: 3000mm, casting speed: 0.40m/ min;Crystallizer vibration amplitude: 12mm, shake frequency: 85 beats/min, crystallizer advanced argument: 10mm;
(3) quickly cooling after rolling: rate of cooling: 40 DEG C/s, the final cooling temperature temperature difference: upper surface of steel plate, lower surface and steel plate Center maximum temperature difference: 3 DEG C.
The metallographic structure figure of the high intensity steel plate of resistance to molten zinc corrosion prepared by the present embodiment is as shown in Figure 3.
Embodiment 4 thickness is the high intensity steel plate of resistance to molten zinc corrosion of 100mm
Steel plate thickness: 100mm, the melting chemical composition of steel plate is by mass percentage: C:0.02%, Si:0.01%, Mn: 0.21%, P:0.009%, S:0.0007%, Alt: 0.045%, remaining is Fe and inevitable impurity.
Prepare the concrete committed step of above-mentioned steel plate and key parameter be as follows:
(1) RH intensive conch: vacuum: 6.0mbar, evacuation processes time: 50min, mixing time: 35min, soft blow Time: 60min;
(2) sheet slab low frequency big amplitude continuous casting: slab thickness: 500mm, width: 3500mm;Casting speed: 0.40m/ min;Crystallizer vibration amplitude: 9mm, shake frequency: 90 beats/min, crystallizer advanced argument: 11mm;
(3) quickly cooling after rolling: rate of cooling: 35 DEG C/s, the final cooling temperature temperature difference: upper surface of steel plate, lower surface and steel plate Center maximum temperature difference: 10 DEG C.
The metallographic structure figure of the high intensity steel plate of resistance to molten zinc corrosion prepared by the present embodiment is as shown in Figure 4.
The performance detection of the high intensity steel plate of resistance to molten zinc corrosion that the present invention is prepared by test example 1, result is as shown in table 1:
The performance of the high intensity steel plate of resistance to molten zinc corrosion prepared by table 1 present invention
The detection method of year molten zinc corrosion speed refer to length and width respectively for the steel plate of 200mm in 450 DEG C of zinc liquid uninterrupted Soak 8760 hours (1 year), under metallurgical microscope, then measure the reduced value of steel plate thickness, be year molten zinc corrosion speed.
It can be seen that the 50-100mm steel plate utilizing the present invention to produce, have obvious resistance to molten zinc corrosion, high intensity, High-ductility, good-toughness.

Claims (8)

1. the high intensity steel plate of resistance to molten zinc corrosion, it is characterised in that the described high intensity steel plate of resistance to molten zinc corrosion melting chemical group Become and be by mass percentage: C≤0.02%;Si≤0.02%;Mn≤0.25%;P≤0.010%;S≤0.001%;Alt≤ 0.050%;Remaining is Fe and inevitable impurity;
The method preparing the above-mentioned high intensity steel plate of resistance to molten zinc corrosion, specifically comprises the following steps that
KR molten iron pretreatment → converter smelting → deoxidation alloying → CAS refine → LF refine → RH intensive conch → sheet slab is low The big amplitude continuous casting → strand of frequency cuts → rolls off the production line slow cooling more than 48 hours → and inspection cleaning → heating of plate blank → high-pressure water descaling → Stand Mill quickly cools down → aligning after rolling → rolling;
Described RH intensive conch: vacuum: 5.0-6.0 mbar, evacuation processes time: 50-60min, mixing time: 30- 40min, soft blow time: 50-60min.
The high intensity steel plate of resistance to molten zinc corrosion the most according to claim 1, it is characterised in that the described big amplitude of sheet slab low frequency Continuous casting: slab thickness scope: 250mm-500mm, width of plate slab scope: 1820-3500mm, casting speed: 0.40-0.50m/ Min, crystallizer vibration amplitude: 8-12mm, shake frequency: 80-90 beat/min, crystallizer advanced argument scope: 8-12mm.
The high intensity steel plate of resistance to molten zinc corrosion the most according to claim 1, it is characterised in that described in roll after quickly cooling: cold But speed: 35-40 DEG C/s, the final cooling temperature temperature difference: upper surface of steel plate, lower surface and steel plate center maximum temperature difference: 0-10 DEG C.
The high intensity steel plate of resistance to molten zinc corrosion the most according to claim 1, it is characterised in that the resistance to molten zinc corrosion of described high intensity When steel plate thickness is 50mm, the melting chemical composition of steel plate is by mass percentage: C:0.02%, Si:0.02%, Mn:0.22%, P:0.008%, S:0.0008%, Alt: 0.035%, remaining is Fe and inevitable impurity;
In manufacture method:
(1) RH intensive conch: vacuum: 5.2mbar, evacuation processes time: 55min, and mixing time: 30min, during soft blow Between: 50min;
(2) sheet slab low frequency big amplitude continuous casting: slab thickness: 250mm, width: 1820mm, casting speed: 0.45m/min;Knot Brilliant device amplitude: 10mm, shake frequency: 86 beats/min, crystallizer advanced argument: 8mm;
(3) quickly cooling after rolling: rate of cooling: 37 DEG C/s, the final cooling temperature temperature difference: upper surface of steel plate, lower surface and steel plate center Maximum temperature difference: 8 DEG C.
The high intensity steel plate of resistance to molten zinc corrosion the most according to claim 1, it is characterised in that the resistance to molten zinc corrosion of described high intensity When steel plate thickness is 60mm, the melting chemical composition of steel plate is by mass percentage: C:0.01%, Si:0.01%, Mn:0.18%, P:0.007%, S:0.0003%, Alt: 0.038%, remaining is Fe and inevitable impurity;
In manufacture method:
(1) RH intensive conch: vacuum: 5.0mbar, evacuation processes time: 59min, and mixing time: 38min, during soft blow Between: 52min;
(2) sheet slab low frequency big amplitude continuous casting: slab thickness: 300mm, width: 2500mm, casting speed: 0.40m/min;Knot Brilliant device amplitude: 12mm, shake frequency: 80 beats/min, crystallizer advanced argument: 8mm;
(3) quickly cooling after rolling: rate of cooling: 39 DEG C/s, the final cooling temperature temperature difference: upper surface of steel plate, lower surface and steel plate center Maximum temperature difference: 7 DEG C.
The high intensity steel plate of resistance to molten zinc corrosion the most according to claim 1, it is characterised in that the resistance to molten zinc corrosion of described high intensity When steel plate thickness is 80mm, the melting chemical composition of steel plate is by mass percentage: C:0.01%, Si:0.01%, Mn:0.20%, P:0.009%, S:0.001%, Alt: 0.045%, remaining is Fe and inevitable impurity;
In manufacture method:
(1) RH intensive conch: vacuum: 5.5mbar, evacuation processes time: 60min, and mixing time: 40min, during soft blow Between: 55min;
(2) sheet slab low frequency big amplitude continuous casting: slab thickness: 400mm, width: 3000mm, casting speed: 0.40m/min;Knot Brilliant device amplitude: 12mm, shake frequency: 85 beats/min, crystallizer advanced argument: 10mm;
(3) quickly cooling after rolling: rate of cooling: 40 DEG C/s, the final cooling temperature temperature difference: upper surface of steel plate, lower surface and steel plate center Maximum temperature difference: 3 DEG C.
The high intensity steel plate of resistance to molten zinc corrosion the most according to claim 1, it is characterised in that the resistance to molten zinc corrosion of described high intensity When steel plate thickness is 100mm, the melting chemical composition of steel plate is by mass percentage: C:0.02%, Si:0.01%, Mn:0.21%, P:0.009%, S:0.0007%, Alt: 0.045%, remaining is Fe and inevitable impurity;
In manufacture method:
(1) RH intensive conch: vacuum: 6.0mbar, evacuation processes time: 50min, and mixing time: 35min, during soft blow Between: 60min;
(2) sheet slab low frequency big amplitude continuous casting: slab thickness: 500mm, width: 3500mm;Casting speed: 0.40m/min;Knot Brilliant device amplitude: 9mm, shake frequency: 90 beats/min, crystallizer advanced argument: 11mm;
(3) quickly cooling after rolling: rate of cooling: 35 DEG C/s, the final cooling temperature temperature difference: upper surface of steel plate, lower surface and steel plate center Maximum temperature difference: 10 DEG C.
The high intensity steel plate of resistance to molten zinc corrosion the most according to claim 1, it is characterised in that the resistance to molten zinc corrosion of described high intensity Steel plate thickness scope is 50-100mm.
CN201510231231.8A 2015-05-08 2015-05-08 A kind of high intensity steel plate of resistance to molten zinc corrosion and manufacture method thereof Expired - Fee Related CN104789861B (en)

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CN1116431C (en) * 2001-09-19 2003-07-30 武汉钢铁(集团)公司 High-energy welded high-toughness steel for resisting corrosion of molten zinc and its preparing process
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