Why it is difficult to produce stainless steel seamless tubes with thin wall thickness?
We get one order on June 13th, 2014, Stainless Steel Seamless Tubes, ASTM A213 TP304, Outside Diameter size in 23mm, Wall Thickness in 1.19mm, minimum wall thickness, length in 16400mm and 16650mm, Bright Annealing. The total quantity in 7 tons. At first, I treat this order as small order. The expected finished time is within June 30th. But after we start the production, I find it is not so easy as it looks like.
In order to ensure the stainless steel tubes quality, we can't compress our production period. July 7 - 8th is the earliest time we finished the production.
Even it is only 7 tons tubes. base on below reasons, the production velocity very slow:
1. Wall thickness of the steel tubes very thin. The speed of cold rolling should be controlled. Only 500KG/day, so that LG-30 cold rolling cost 14 days!
2. The length of steel tubes longer than 16000mm. The handle for degreasing will be slow.
3. Shipment of condition of the steel tubes in bright annealing. (If Pickle annealing, we can choose cold drawn, cold drawn will be much sooner than cold rolling.)
4. Outside diameter size of the tubes in 23mm, it is non-conventional size. We need make a new molding, and we only have 1 molding, because it is only 7 tons, we need save cost for our customer.
Base on above reasons, the production speed very slow. By the way, if you have orders with OD size 23mm, we can produce for you in lower cost and high quality. Because we have OD 23mm cold rolling molding, the molding cost more than USD 1200. So we can cold rolling the tubes for you.
Base on the same reason, we have 16mm, 18mm, 19mm, 19.05mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 25.4mm, 26mm, 27mm, 28mm, 30mm, 32mm cold rolling molding etc.
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