Submerged arc welding method for BB503 steel plate welded joint of 100mm thick blast furnace shell

A technology of BB503 and welded joints, which is applied in the field of submerged arc welding, can solve problems such as complex working conditions, and achieve the effect of strong practicability and excellent strength and toughness matching

Inactive Publication Date: 2019-02-19
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] As an important supporting member of the furnace structure, the blast furnace shell plays the role of sealing gas leakage, and at the same time needs to bear the effects of s

Method used

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  • Submerged arc welding method for BB503 steel plate welded joint of 100mm thick blast furnace shell
  • Submerged arc welding method for BB503 steel plate welded joint of 100mm thick blast furnace shell
  • Submerged arc welding method for BB503 steel plate welded joint of 100mm thick blast furnace shell

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Embodiment Construction

[0029] A submerged arc welding method with excellent strength and toughness of BB503 steel plate welding joints for 100mm thick blast furnace shells. The 100mm thick blast furnace shells delivered in normalizing state use BB503 steel plates with excellent strength and toughness. The welding test plate combination is 100mm+100mm. The plate size is 900mm (length) × 200mm (width) × 100mm (thickness), and the submerged arc welding is completed. Table 1 shows the properties of the steel plate base materials of Examples 1, 2, and 3.

[0030] Table 1 Base metal properties

[0031] Example

Rp0.2 / MPa

Rm / MPa

A / ％

(-20℃)KV 2 / J

Example 1

365

563

30

272,261,285

Example 2

368

549

33

244,212,231

Example 3

344

531

32

265,241,256

[0032] The flux matching the welding wire is 880M, and the mechanical properties of the corresponding submerged arc welding deposited metal: tensile strength ≥ 540MPa, yiel

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Abstract

The invention discloses a submerged arc welding method with excellent toughness of a welded joint of a BB503 steel plate for a 100 mm thick blast furnace shell. The tensile strength of the BB503 steelplate is 500 - 600 MPa, the yield strength is 330 - 400 MPa, and the elongation rate is no less than 24%, minus 20 DEG C low temperature impact energy is no less than 100 J. The welding material matched with BB503 steel plate with excellent mechanical properties is made of symmetrical K-shaped groove; submerged arc flux is treated (200 - 350) DEG C x 2hours; the steel plate is free from preheating before welding, the thickness is 100 mm + 100 mm steel plate combination is welded by multi-layer submerged arc welding, and the temperature between the welding lines is no more than 200 DEG C. Thewelded joint of a BB503 steel plate for a 100 mm thick blast furnace shell has excellent comprehensive mechanical properties, high production efficiency and strong practicability, and is suitable forapplication and promotion of steel welding for blast furnace shells.

Description

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Claims

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Application Information

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Owner NANJING IRON & STEEL CO LTD
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