Q1Is the tensile strength 400 MPa or 440 MPa?
Both figures circulate, and that is worth knowing before you place an order. The dedicated listing for this grade — reproduced in section 06 — publishes a minimum of 400 MPa, and that is the value we have carried into the tables on this page. Another group of listings, including pages within our own group of sites, publishes 440 MPa for SG295. We are not going to pick one silently on your behalf. Write the value you require into the enquiry and the purchase order so the certificate can be checked against something specific.
Q2Are SG295 and HP295 the same material?
No. Published equivalence tables pair them — and pair SG255 with HP265 — because they sit at essentially the same strength level and are often used for the same cylinder designs. They remain separate specifications written by different bodies, with different chemistry limits: GB/T 6653 sets its own figures and adds its own thin-gauge elongation values, and neither carries the other’s certification route. Substituting one for the other is an engineering decision that has to be cleared against the design code and your approval, not just against the yield number. See section 04 and the
HP295 page.
Q3What sizes can you supply, and from stock?
The published range on this page is 1.5–5 mm thick, 400–2000 mm wide, 1000–18000 mm long, as plate, sheet or coil, with stock shown as available and custom production running 10–40 working days. Two cautions: our own group publishes a wider window — 1.5–12 mm — on other pages for this grade, and not every thickness is rolled at every width. Send the size you actually run and we will confirm what can be supplied against the rolling programme.
Q4Should I move up to SG325 for a stronger cylinder?
Usually not by default. SG325 carries a 325 MPa minimum yield and a 490 MPa tensile requirement, but the published elongation minimum steps down from 26% to 22%. That lost elongation is exactly the margin you spend in deep drawing and seam welding, so a higher grade generally demands more of the press tooling and of the welding procedure. SG295 sits where it does because most domestic and commercial LPG designs want both figures. If wall thickness is driving the design, ask us to price both against your drawing.
Q5Can this plate be certified for my cylinder approval?
Every delivery ships with a mill test certificate to JIS G 3116 with heat-number traceability, covering chemical analysis and tensile results, and third-party inspection can be arranged. What the certificate cannot do is retrospectively cover a requirement that was never stated — additional bend testing, impact testing or inspection conditions have to go into the enquiry and the purchase order. If your approval calls for limits on elements outside the five published in section 05, say so at the same stage.
Q6What do you need to quote a price?
The standard and edition plus the full grade, thickness together with sheet dimensions or coil width and weight, quantity, product form and surface condition, the pressing and welding process you run, any test or inspection requirement beyond the base specification, and the destination port. If you are unsure between grades, send the cylinder drawing or the design pressure and we will tell you which member of the series we would press.
