{"id":7928,"date":"2026-10-16T08:22:37","date_gmt":"2026-10-16T08:22:37","guid":{"rendered":"https:\/\/chinametalfoundry.com\/?p=7928"},"modified":"2026-10-16T08:22:37","modified_gmt":"2026-10-16T08:22:37","slug":"cast-steel-grades","status":"publish","type":"post","link":"https:\/\/chinametalfoundry.com\/pl\/blog\/cast-steel-grades\/","title":{"rendered":"Cast Steel Grades: ASTM A27, A216, A148 and How to Specify Them"},"content":{"rendered":"
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Cast steel grades decide whether a 45 kg bracket survives a \u221240 \u00b0C winter, whether a valve body can be welded into a pipeline without preheat cracks, and whether you pay $98 or $149 for the same pile of molten metal. Most RFQs get this wrong by naming a grade that was never the right one \u2014 usually by copying a competitor drawing.<\/p>\n<\/div>\n

This guide walks through the ASTM cast steel grades that actually show up in export RFQs \u2014 A27, A216, A148, A352, A217, A128 \u2014 how to read the grade designation, what the number pairs really guarantee, and where buyers lose money by over-specifying. Every number below is a minimum from the grade designation or a worked calculation you can re-run on your own part. Standards references come from ASTM International<\/a>, the American Foundry Society (AFS)<\/a> oraz ASME<\/a> \u2014 always confirm against the current edition before you sign a PO. If you need the process context behind these grades, start with our przewodnik po odlewaniu metali<\/a>. Below we stay narrow on purpose: the cast steel grades you will actually be asked to quote, not the whole ASTM catalogue.<\/p>\n

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Same geometry, two different cast steel grades \u2014 the cost gap starts at the melt, not at the machine.<\/figcaption><\/figure>\n

What Cast Steel Grades Actually Guarantee<\/h2>\n

A cast steel grade is not a chemistry recipe. It is a promise of mechanical properties<\/strong>, tested on a coupon, delivered in a defined heat treatment condition. Chemistry is usually a ceiling, not a target \u2014 the foundry dials the melt to hit strength, and the spec limits elements that hurt weldability or toughness.<\/p>\n

Three things trip buyers up:<\/p>\n