Forming requirements for duplex steel heads
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The examples are as follows: the head size ranges from EHA3200 to 5100 mm, the thickness ranges from t10 to t50 mm, and the material is SA-31803. The indicator I have in mind for now is the thickness reduction rate. Are there any other requirements, such as ferrite content or hardness specifications?
Consult the outsourcing supplier regarding the thinning rate; don’t worry, there’s nothing special about duplex steel either. Larger end cap factories have no problem
Following standard production methods gives you more confidence when calculating these figures
Individual requests can be made as needed; if there are many of them, the end cap manufacturer should be asked to provide a pressing process.
This post was last edited by latern on 2019-12-18 at 14:05. We specified that the minimum ferrite content should be 35%, with a hardness of less than or equal to 28HRC. Later, all our suppliers replied that they couldn’t meet it, and I’ve never seen such a request again. I was wondering: this is a requirement for the S31803 material, so can it fail to meet this requirement just by being molded?
In fact, our duplex steels are all hot-pressed, and after shaping they undergo solution heat treatment, and are even left to stand for a month. It still fails.
It is recommended to use cold forming for thin sheet materials of duplex steel, as the hardness and ferrite content after hot forming followed by solution treatment cannot be guaranteed with reliability.
Cold forming should be used whenever possible, but it is essential to consider the impact of the degree of deformation on the material’s properties; cold stamping is preferred over cold spinning. Solid quenching is required after hot forming, with heat treatment test plates used as witnesses