A high-end passenger ferry steel with a thickness of less than 12mm and its manufacturing method

A high-end, ferry technology, applied in the high-end passenger ferry steel and its manufacturing field, can solve the problems of small loading tonnage and load area, not suitable for large-scale and heavy-duty ferry requirements, and achieve stable and improved production process. Inclusion morphology, fine grain effect

Active Publication Date: 2021-07-13
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the small loading tonnage and load-carrying area of ​​the traditional 49-meter ferry, it is no longer suitable for the large-scale and heavy-duty ferry transportation requirements. In order to improve the transportation capacity of the steam ferry, it is urgent to upgrade the steam ferry

Method used

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  • A high-end passenger ferry steel with a thickness of less than 12mm and its manufacturing method
  • A high-end passenger ferry steel with a thickness of less than 12mm and its manufacturing method
  • A high-end passenger ferry steel with a thickness of less than 12mm and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The production method of Example 1 is as follows: steelmaking and continuous casting: S: 0.003% after desulfurization of molten iron; converter smelting adopts high-blowing and low-drawing method for dephosphorization, and converter tapping slag; refining adopts white slag operation, and the white slag retention time is 13mmin , the total refining time is 30min; the vacuum degree is 3.0mbar, and the treatment retention time is 20min. After the vacuum treatment, the seamless calcium line treatment is carried out, and the static stirring time is 12min; / min;

[0047] Rolling: Heating temperature before rolling is 1280°C, billet thickness is 150mm, total heating time is 165min, rolling temperature is 1200°C, rolling passes are 9 passes, air cooling is carried out after rolling, hot straightening is carried out for 3 passes, hot straightening temperature is 700°C, warm straightening 1 pass, temperature correction temperature 380 ℃;

[0048] Heat treatment: quenching temper...

Embodiment 2

[0049] The production method of embodiment 2 is as follows:

[0050] Steelmaking and continuous casting: S: 0.0025% after molten iron desulfurization; converter smelting adopts double slag method for dephosphorization, converter taps steel to block slag; refining adopts white slag operation, white slag retention time 15mmin, total refining time 33min; vacuum degree 3.0mbar , the treatment holding time is 20 minutes, the seamless calcium line treatment is carried out after the vacuum treatment, and the static stirring time is 13 minutes; the target temperature of the continuous casting tundish is the liquidus temperature +10°C, and the casting speed is 0.8m / min;

[0051] Rolling: Heating temperature before rolling is 1250°C, billet thickness is 150mm, total heating time is 150min, rolling temperature is 1180°C, rolling passes are 7 passes, air cooling is carried out after rolling, hot straightening is carried out 2 passes, hot straightening temperature is 800°C, warm straighteni...

Embodiment 3

[0053] The production method of embodiment 3 is as follows::

[0054] Steelmaking and continuous casting: S: 0.0030% after molten iron desulfurization; converter smelting adopts double slag method for dephosphorization, converter tapping to block slag; refining adopts white slag operation, white slag retention time 14mmin, total refining time 40min; vacuum degree 3.0mbar , The treatment holding time is 21 minutes, the seamless calcium line treatment is carried out after the vacuum treatment, and the static stirring time is 13 minutes; the target temperature of the continuous casting tundish is the liquidus temperature + 5°C, and the casting speed is 0.9m / min;

[0055] Rolling: Heating temperature before rolling is 1230°C, billet thickness is 150mm, total heating time is 135min, rolling temperature is 1180°C, rolling passes are 7 passes, air cooling is carried out after rolling, hot straightening is done once, hot straightening temperature is 850°C, warm straightening 3 passes,...

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Abstract

The invention discloses a high-end passenger ferry steel with a thickness below 12mm, C: 0.06%-0.09%, Si: 0.15%-0.30%, Mn: 1.40%-1.60%, P≤0.012%, S≤0.002%, Nb: 0.010%~030%, V: 0.030%~0.040%, Ti: 0.005%~0.020%, Cr: 0.20%~0.30%, Mo: 0.11%~0.17%, Al: 0.0250%~0.050%, O≤ 15ppm, N≤38ppm, H≤2ppm, does not contain Ni, Cu, and the balance is Fe and unavoidable impurities. Technical effect: The present invention develops high-end passenger ferry steel with a thickness of ≤12 mm at low cost and excellent plate shape within the chemical composition range of GB712 and the standards of the top ten classification societies. The steel type does not contain precious elements Ni and Cu. Contains a small amount of Mo and does not require high load on the rolling mill. It can be produced by general medium and heavy plate rolling mills. Therefore, it has wide applicability and is suitable for production by most domestic medium and heavy plate factories.

Description

technical field [0001] The invention relates to the technical field of high-end ship steel, in particular to a high-end passenger ferry steel with a thickness of less than 12mm and a manufacturing method thereof. Background technique [0002] In recent years, with the adjustment of the national macro-economy and the development of the transportation and logistics industry, as well as the suspension of toll collection on national and provincial highways, a large number of trucks have chosen to cross the river by car in order to reduce logistics costs. Due to the small loading tonnage and load-carrying area of ​​the traditional 49-meter ferry, it is no longer suitable for the large-scale and heavy-duty ferry transportation requirements. In order to improve the transportation capacity of the steam ferry, it is urgent to upgrade the steam ferry. The 60-meter heavy-duty passenger ferry with a deadweight tonnage of 720 tons can not only relieve the pressure on ferry production, bu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26C22C38/28C22C38/38C21D8/02C22C33/04
CPCC21D8/0205C21D8/0226C21D8/0263C22C33/04C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26C22C38/28C22C38/38
Inventor 车马俊赵晋斌张晓雪陈林恒李恒坤付军邱保文伯飞虎
Owner NANJING IRON & STEEL CO LTD
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