A continuous casting production process of sm4gr2mnni mold steel plate with low pressure reduction ratio and high flaw detection requirement
A production process and scaling technology, applied in the field of die steel manufacturing, can solve problems such as the large difference in the composition of the head and tail of the steel ingot, affecting the processing and use of users, and the overall performance difference of the material, so as to improve the yield of finished products, shorten the production cycle and reduce the production cost. Effect
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Embodiment 1
[0029] The thickness of the SM4Cr2MnNi plastic mold steel plate suitable for low compression ratio and high flaw detection requirements involved in this embodiment is 250 mm, the compression ratio is 1.8, and its chemical composition is calculated by mass percentage: C: 0.43%, Si: 0.25%, Mn: 1.55% , P: 0.013%, S: 0.005%, Cr: 2.00%, Mo: 0.20%, Ni: 1.15%, and the balance is Fe and unavoidable impurity elements.
[0030] The manufacturing process of the steel plate is as follows:
[0031] Production process: converter steelmaking→refining→vacuum degassing→450mm continuous casting slab→hot delivery→heating→slab rolling→heating→secondary rolling→heat treatment→flaw detection→finishing→inspection→warehousing.
[0032] The specific operation of the main process is as follows:
[0033] Refining and vacuum degassing treatment reduce the five harmful elements in steel, and adopt light reduction technology to ensure the internal quality of 450mm continuous casting slab. On the basis of ...
Embodiment 2
[0041] The thickness of the SM4Cr2MnNi plastic mold steel plate suitable for low compression ratio and high flaw detection requirements involved in this embodiment is 200mm, the compression ratio is 2.25, and its chemical composition is calculated by mass percentage: C: 0.43%, Si: 0.25%, Mn: 1.50% , P: 0.012%, S: 0.005%, Cr: 1.95%, Mo: 0.20%, Ni: 1.10%, and the balance is Fe and unavoidable impurity elements.
[0042]The manufacturing process of the steel plate is as follows:
[0043] Production process: converter steelmaking→refining→vacuum degassing→450mm continuous casting slab→hot delivery→heating→slab rolling→heating→secondary rolling→heat treatment→flaw detection→finishing→inspection→warehousing.
[0044] The specific operation of the main process is as follows:
[0045] Refining and vacuum degassing treatment reduce the five harmful elements in steel, and adopt light reduction technology to ensure the internal quality of 450mm continuous casting slab.
[0046] The bil...
Embodiment 3
[0053] The thickness of the SM4Cr2MnNi plastic mold steel plate suitable for low compression ratio and high flaw detection requirements related to this embodiment is 180mm, the compression ratio is 2.5, and its chemical composition is calculated by mass percentage: C: 0.42%, Si: 0.25%, Mn: 1.50% , P: 0.013%, S: 0.004%, Cr: 1.90%, Mo: 0.20%, Ni: 1.10%, and the balance is Fe and unavoidable impurity elements.
[0054] The manufacturing process of the steel plate is as follows:
[0055] Production process: converter steelmaking→refining→vacuum degassing→450mm continuous casting slab→hot delivery→heating→slab rolling→heating→secondary rolling→heat treatment→flaw detection→finishing→inspection→warehousing.
[0056] The specific operation of the main process is as follows:
[0057] Refining and vacuum degassing treatment to reduce the five harmful elements in the steel, and the use of light reduction technology to ensure the internal quality of 450mm continuous casting slab, see th...
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