A335 P22 is a 2.25Cr-1Mo chromium-molybdenum steel. It is specified not for its room-temperature strength, but because elevated-temperature strength, creep resistance and weldability must all hold at once. That combination is the reason the grade appears in subcritical power plants, refinery heater headers, hydrogenation units and other elevated-temperature pressure systems.<\/p>\n
The pipe begins life as a seamless mother pipe of the same grade. When the required outside diameter exceeds what the mother pipe mill can produce, the hollow is reheated and hot expanded to size. Since the expansion works on a seamless body, the finished pipe keeps an unbroken wall and the metallurgy of the original grade, instead of gaining the longitudinal weld that a formed-and-welded route would introduce.<\/p>\n
Expansion itself is a hot deformation, so the pipe does not leave the line as expanded. It is normalised at 900\u20131000\u00b0C and then tempered at 700\u2013800\u00b0C.<\/p>\n
What the process buys is reach. Outside diameters go up to 48 in, with walls ordered by schedule \u2014 SCH 40, SCH 80, SCH 160 or XXS \u2014 supplied in random or fixed lengths and beveled for welding.<\/p>\n
<\/p>\n
<\/p>\n
<\/p>\n
<\/p>\n
<\/p>","protected":false},"excerpt":{"rendered":"
HongCheng supplies A335 P22 hot expanded seamless steel pipe made from an ASTM A335 P22 mother pipe and thermally expanded to the required outside diameter up to 48 in. Delivered normalized and tempered in SCH 40, SCH 80, SCH 160 or XXS with beveled ends, it serves refinery and power plant piping at roughly 450\u2013565\u00b0C.<\/p>\n
<\/p>\n
<\/p>\n
<\/p>\n
<\/p>\n
<\/p>","protected":false},"featured_media":443,"template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[22],"product_tag":[],"class_list":["post-440","product","type-product","status-publish","has-post-thumbnail","product_cat-alloy-steel-pipes","first","instock","shipping-taxable","product-type-simple"],"acf":[],"_links":{"self":[{"href":"https:\/\/hcpiping.com\/de\/wp-json\/wp\/v2\/product\/440","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hcpiping.com\/de\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/hcpiping.com\/de\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hcpiping.com\/de\/wp-json\/wp\/v2\/media\/443"}],"wp:attachment":[{"href":"https:\/\/hcpiping.com\/de\/wp-json\/wp\/v2\/media?parent=440"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/hcpiping.com\/de\/wp-json\/wp\/v2\/product_brand?post=440"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/hcpiping.com\/de\/wp-json\/wp\/v2\/product_cat?post=440"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/hcpiping.com\/de\/wp-json\/wp\/v2\/product_tag?post=440"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}