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Welding technology of super martensitic stainless steel

A martensitic stainless steel, super martensitic technology, used in welding equipment, welding/welding/cutting items, manufacturing tools, etc., can solve the problems of reduced corrosion resistance, low production efficiency, high price, etc., to improve performance , The effect of improving welding efficiency and reducing production costs

Inactive Publication Date: 2009-12-09
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As this new type of stainless steel is a high-strength steel, the hardness of its welded joints, especially the root weld, tends to be too high, resulting in reduced corrosion resistance
Therefore, the current welding method for this material is to adopt a post-weld heat treatment process to reduce the hardness of the welded joint and improve the corrosion resistance. Due to the special requirements for the post-weld heat treatment process of this material, the heating rate is required to be greater than 100 ° C / Min, the heating speed is required to be fast, so intermediate frequency or high frequency heat treatment equipment is required. This equipment is expensive, and due to the increase of post-weld heat treatment process, the production efficiency will be low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Welding Φ324×22mm 12Cr super martensitic stainless steel. The main operation steps are as follows:

[0020] 1. Preparation process before welding:

[0021] ①Preparation of the groove, using the plasma method to prepare a single-sided V-shaped groove, the groove angle is 60°, the gap is 2mm, and the blunt edge is 1mm; clean the groove and both sides of the inner and outer walls until the metallic luster is exposed;

[0022] ② Butt assembly groove, check to confirm that there is no defect within 20mm of the welded part and its edge;

[0023] ③ Select the welding material, the welding wire adopts ER2209 Sandvik22.8.3. duplex stainless steel welding wire, the diameter is φ2.0mm; the welding rod adopts E2209-17 LSandvik22.9.3.LR duplex stainless steel welding rod, the diameter is φ3.25mm;

[0024] ④ Preheating before welding, preheating the welding area and the surrounding 75mm range of welding parts, using a grill to preheat, and the preset temperature is 50°C.

[0025] ...

Embodiment 2

[0031] Φ324×12mm 12Cr super martensitic stainless steel is welded. The main operation steps are as follows:

[0032]1. Preparation process before welding:

[0033] ①Preparation of the groove, using the plasma method to prepare a double-sided V-shaped groove, the groove angle is 65°, the gap is 4mm, and the blunt edge is 2mm; clean the groove and both sides of the inner and outer walls until the metallic luster is exposed;

[0034] ② Butt assembly groove, check to confirm that there is no defect within 22mm of the welded part and its edge;

[0035] ③ Select the welding material, the welding wire adopts ER2209 Sandvik22.8.3. duplex stainless steel welding wire, the diameter is φ2.4mm; the welding rod adopts E2209-17 LSandvik22.9.3.LR duplex stainless steel welding rod, the diameter is φ3.25mm;

[0036] ④Preheat before welding, preheat the welding area and the surrounding 80mm range of welding parts, use the grill to preheat, and the preset temperature is 60°C.

[0037] 2. Bot...

Embodiment 3

[0043] 12Cr super martensitic stainless steel of 1200×300×22mm is welded. The main operation steps are as follows:

[0044] 1. Preparation process before welding:

[0045] ①Preparation of the groove, using the plasma method to prepare a double-sided V-shaped groove, the groove angle is 65°, the gap is 4mm, and the blunt edge is 2mm; clean the groove and both sides of the inner and outer walls until the metallic luster is exposed;

[0046] ② Butt assembly groove, check to confirm that there is no defect within 20mm of the welded part and its edge;

[0047] ③ Select the welding material, the welding wire is ER2209 Sandvik22.8.3. Duplex stainless steel welding wire, the diameter is φ2.4mm;

[0048] ④ Preheating before welding, preheating the welding area and the surrounding 70mm range of welding parts, using resistance heaters for preheating, the preheating temperature is 80 °C.

[0049] 2. Bottom welding process:

[0050] Manual argon tungsten arc welding is used for bottom ...

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Abstract

The invention provides a welding technology of super martensitic stainless steel, which comprises the processes of a preweld preparatory process including bevel preparation of super martensitic stainless steel, splicing and assembly of bevel and weld material choosing, a backing welding process and a filling welding and facing welding process, wherein the preweld preparatory process is provided with a preweld preheating step for preheating a welding part at the temperature of 50-70 DEG C; the welding material chosen in the preweld preparatory process comprises two phase stainless steel welding sticks and two phase stainless steel welding rods; the backing welding process adopts manual argon tungsten arc welding; and the filling welding and facing welding process adopts manual argon tungsten arc welding or shielded metal arc welding. The invention improves the performance of welded splices, in particular the rigidity and the decay resistance, omits the heat treatment process after welding, reduces processes, enhances the welding efficiency and reduces the production cost.

Description

technical field [0001] The invention relates to welding technology, in particular to a welding process of super martensitic stainless steel. Background technique [0002] The martensitic stainless steel involved in the present invention is a new type of stainless steel material developed and used in recent years. Its main chemical composition is 0.012C-12Cr-5Ni-2Mo-0.01N, with ultra-low C and N content and excellent mechanical properties Performance and corrosion resistance, known as 12Cr super martensitic stainless steel. This new type of stainless steel can be used to enrich CO 2 and H 2 In the environment of S, its strength is X80 grade, and it has sufficient low temperature toughness, which is an economical material with high life cycle and low cost. [0003] Since this new type of stainless steel is a high-strength steel, the hardness of its welded joints, especially the root bead, tends to be too high, resulting in reduced corrosion resistance. Therefore, the curre...

Claims

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Application Information

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IPC IPC(8): B23K9/23B23K9/235B23K9/16B23K9/095B23K103/04
Inventor 曹军陈英王金生傅健汪春标
Owner CHINA NAT OFFSHORE OIL CORP
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