A kind of low-carbon cr-ni series high-strength corrosion-resistant steel and its preparation method

A high-strength, corrosion-resistant steel technology, applied in the field of corrosion-resistant steel, can solve the problems that corrosion-resistant steel cannot meet various corrosion environments, and achieve the effects of avoiding localized corrosion, enhancing compactness, and improving corrosion resistance

Active Publication Date: 2021-12-03
CENT IRON & STEEL RES INST +1
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  • Application Information

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Problems solved by technology

[0004] In view of the above analysis, the present invention aims to provide a low-carbon Cr-Ni series high-strength corrosion-resistant steel and a preparation method thereof, to solve the problem that corrosion-resistant steels in the prior art cannot meet various corrosion environments, and to meet the requirements of mechanical properties On the basis of ensuring corrosion-resistant steel to meet a variety of corrosive environments

Method used

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  • A kind of low-carbon cr-ni series high-strength corrosion-resistant steel and its preparation method
  • A kind of low-carbon cr-ni series high-strength corrosion-resistant steel and its preparation method
  • A kind of low-carbon cr-ni series high-strength corrosion-resistant steel and its preparation method

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preparation example Construction

[0045] A preparation method of low-carbon Cr-Ni series high-strength corrosion-resistant steel, comprising the following steps:

[0046] Step 1: smelting and casting to obtain a billet;

[0047] Step 2: Homogenize the slab, that is, heat to the austenite homogenization temperature and keep it warm;

[0048] Step 3: After heat preservation, the cast slab is removed from the furnace and then rolled directly, and the rolling process adopts two-stage rolling of recrystallized rough rolling and non-recrystallized finish rolling; wherein, the cumulative deformation of rough rolling is ≥ 65%;

[0049] Step 4: After rolling to the target thickness in step 3, laminar cooling to 550-750°C for coiling to obtain coils;

[0050] Step 5: Anneal the coil.

[0051] Specifically, in the above step 1, vacuum induction smelting is adopted according to the composition of the corrosion-resistant steel, and die casting is used to form an ingot.

[0052] Specifically, in the above step 1, convert...

Embodiment 1

[0066] Embodiment 1 and the remaining comparative examples 2-3 are vacuum smelted and continuously cast into blanks with a specification of 60mm (thick) × 70mm (wide), cut 1 block of 60mm (thick) × 70mm (wide) × 100mm, and heated to 1150 Insulate at -1250°C for 1 hour, remove the scale after coming out of the furnace, rough rolling according to 60mm-48mm-38mm-32mm-25mm-20mm (positive tolerance), finish rolling according to 16mm-13mm-11mm (positive tolerance), and the finished product is about 1m long , the final rolling temperature is not lower than 900°C, laminar cooling to 550-750°C for coiling, the hot-rolled coil is cooled to below 100°C and then reheated to 550-700°C, and kept for 0.5-5h. Since the steel of the present invention has high hardenability, a higher coiling temperature can also be used to obtain the same strength as that of a relatively low coiling temperature, and the coiling temperature window is wide. The purpose of cooling the hot-rolled coil to below 100°...

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Abstract

The invention discloses a low-carbon Cr-Ni high-strength corrosion-resistant steel and a preparation method thereof, which belongs to the technical field of corrosion-resistant steels and solves the problem that the corrosion-resistant steels in the prior art cannot meet various corrosion environments. Alloy composition of low-carbon Cr-Ni high-strength corrosion-resistant steel in terms of mass percentage: C: 0.01%-0.03%, Cr: 3.0%-10.0%, Ni: 1.0%-2.0%, Si: 0.1%-0.5% , Mn: 0.5%‑1.0%, P: 0.04%‑0.10%, S: ≤0.005%, N: 0.02%‑0.06%, Cu: 0.2%‑0.5%, and the balance is Fe and unavoidable impurities. The low-carbon Cr-Ni high-strength corrosion-resistant steel of the present invention has excellent mechanical properties, excellent marine atmospheric corrosion resistance, industrial atmospheric corrosion resistance and seawater corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of corrosion-resistant steel, in particular to a low-carbon Cr-Ni series high-strength corrosion-resistant steel and a preparation method thereof. Background technique [0002] Corrosion is one of the three major failure modes in the field of metal materials. According to macro statistics, all metal materials lose about 1% of their weight due to corrosion every year. This loss is more serious in tropical and marine environments. From a global perspective, the economic losses caused by corrosion account for about 3%-4% of the country's total economic output. Based on the huge economic losses caused by corrosion, researchers have also proposed a series of protective measures, such as corrosion-resistant coatings (epoxy and metal coatings), adding corrosion inhibitors, electrochemical protection, etc., but these methods exist or More or less disadvantages, such as corrosion-resistant coatings can effectively d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C21D8/02C22C33/04
CPCC21D8/0205C21D8/0226C21D8/0263C22C33/04C22C38/001C22C38/002C22C38/02C22C38/04C22C38/42
Inventor 李昭东曹燕光陈润农雍岐龙杨忠民陈颖王慧敏
Owner CENT IRON & STEEL RES INST
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