Calcium treatment for A350 LF2 and content of S < 0,003%
Calcium treatment for A350 LF2 and content of S < 0,003%
(OP)
We are forged valve manufacture and an end user is requesting for carbon steel calcium treated and with content S less than 0,003%.
Our forging companies are saying that the calcium treatment is a very old treatment and in the last years it has been replaced by the use of vacuum during the production of the material (in this case A350 LF2). Does anybody know any reference to this point to demonstrate to our end-user ?
Thank you in advance for any help
Corrado
Our forging companies are saying that the calcium treatment is a very old treatment and in the last years it has been replaced by the use of vacuum during the production of the material (in this case A350 LF2). Does anybody know any reference to this point to demonstrate to our end-user ?
Thank you in advance for any help
Corrado





RE: Calcium treatment for A350 LF2 and content of S < 0,003%
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RE: Calcium treatment for A350 LF2 and content of S < 0,003%
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RE: Calcium treatment for A350 LF2 and content of S < 0,003%
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Calcium treatment for A350 LF2 and content of S < 0,003%
Corrado
RE: Calcium treatment for A350 LF2 and content of S < 0,003%
RE: Calcium treatment for A350 LF2 and content of S < 0,003%
RE: Calcium treatment for A350 LF2 and content of S < 0,003%
RE: Calcium treatment for A350 LF2 and content of S < 0,003%
ISO 15156-2, Clause 8 states:
"The probability of HIC/SWC is influenced by steel chemistry and manufacturing route. The level of sulfur in the steel is of particular importance, typical maximum acceptable levels for flat-rolled and seamless products are 0,003 % mass fraction and 0,01 % mass fraction, respectively. Conventional forgings with sulfur levels less than 0,025 % mass fraction, and castings, are not normally considered sensitive to HIC or SOHIC."
Naturally, the steelmaker is going to have to cast a good clean steel to achieve the Charpy requirements of A350 LF2. This, in itself, should be reassurance as to H2S service performance.
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04