How to heat treat 13MnNiMoR+s30408 materials? How to conduct flaw detection?
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I’ve looked through a lot of materials, but there’s no consensus. I’d appreciate your advice, thank you.
Heat treatment is determined based on the substrate: normalizing followed by tempering.
First, weld the base layer, then conduct 100% radiographic testing. Once the weld repairs are fully satisfactory, weld the transition layer and carry out 100% penetrant testing. As for heat treatment, it is necessary to carry it out; ideally, in accordance with welding procedures, the heat treatment temperature should be reduced and the treatment time increased, while trying to avoid the sensitization zone – although it’s actually impossible to avoid it completely. According to pages 107 and 108 of the welding procedures, the minimum heat treatment temperature is 600°C; this temperature can be reduced by up to 110 degrees, but the holding time must be at least 20 hours. Heat treatment is indeed a difficult issue; for that very reason, it is rarely discussed in standards, and when it is mentioned, the discussions are vague and avoid addressing the core issues. I have an idea: after the base welding and flaw detection are successful, heat treatment is carried out, followed by the application of a coating layer.
The original poster has a question. Complete it for me. . . You are in charge of the heat treatment and flaw detection of raw material composite panels ； Or the heat treatment and flaw detection of composite panel containers? ? ? The 2nd and 3rd floors have already each indicated a different direction. Because it’s impossible to normalize and temper a container. The 2nd floor definitely refers to normalizing and tempering of the sheet metal. The base welding and transition layer welding mentioned on the 3rd floor refer to the manufacturing of the container. . .
After the base welding is completed, heat treatment is carried out, followed by welding of the overlay layer. . . Actually, you know it’s inevitable. . . Hasn’t the cladding of the composite panel also been sent in with the furnace? ? ? Hehe. . .
For containers made of composite panels, heat treatment is indeed rather troublesome. Especially with stainless steel, such as S30408, problems are more likely to occur.
If you’re so troubled by this, I think choosing composite panels for the design was a mistake in the first place. . It’s unavoidable!
1. Post-weld heat treatment follows the base material 13MnNiMoR. 2. The cladding uses the dual-certified material S30408 (S30403), which requires that the carbon content in S30408 be below 0.03%. 3. The welding materials should also be of dual-certified type (meeting 308L grade, with C≤0.03%). Of course, it would be better to avoid post-weld heat treatment of the corrosion-resistant layer.
1. Note that the tensile strength of 13MnNiMoR is greater than 540; therefore, all standards specifying a tensile strength of over 540 apply in this case； 2. Welding of composite panels
It refers to the welds of the cylinder formed by rolling this composite steel plate