Containers and storage equipment: [Weekly Topic] On the issue of substituting materials for new container regulations
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This post was last edited by SuperFree2316 on 2011-3-22 at 21:36. During the manufacturing process, I encountered foreign materials such as 304, 304L, 316, and 316L, which are used as substitutes for domestic materials like 06Cr19Ni10, 022Cr19Ni10, 06Cr17Ni12Mo2, and 022Cr17Ni12Mo2. Regarding paragraphs (2) and (4) of section 2.9.1 in the fixed regulatory standard TSG R0004-2009, I would like to know whether the chemical composition and mechanical properties of these foreign materials should be tested in accordance with the standards specified for those foreign materials, or whether they should be tested according to the standards of the domestic equivalents and meet those requirements. Please help resolve this issue, thank you!
Proceed in accordance with the execution standards of this material.
Does the statement on the 2nd floor mean that it should be done in accordance with the standards for 304 material used abroad?
Are LZ’s devices used in China? If so, using materials of foreign brand names to manufacture such equipment involves very complicated procedures, and it is necessary to meet the requirements outlined in 2.9 ； If used abroad, there are no excessive restrictions
My understanding is that the grade according to foreign standards should comply with the corresponding foreign standards, but retesting is required; the chemical composition and mechanical properties obtained from this retesting should be no lower than those of the corresponding grade under domestic standards.
For material grades not listed in the tolerance specifications, Clause 1.9 must still be followed.
I have also considered this matter carefully, consulted with the manufacturing and design teams, and agree that the view expressed on the 6th floor is quite reasonable. Since the mechanical properties of materials are determined based on domestic standards during the design phase, when foreign materials are used as substitutes, those substitute materials must be retested to ensure that their chemical composition and mechanical properties meet or exceed the requirements set by domestic standards. In other words, foreign materials need to be retested in accordance with the standards applicable to domestic materials. The grades of foreign materials purchased shall meet the requirements of foreign standards upon procurement.
Currently, stainless steel grades are designated by the numerical codes specified in GB/T20878. Since steel plates with new grades are not available on the market, materials based on foreign standards must meet the chemical composition and performance requirements of the new domestic standards. Whether retesting of the materials is necessary depends on the regulations set by the local authorities responsible for supervising special equipment.
This post was last edited by wanyuanchen on 2011-3-24 08:51. I think it’s like having two names at the same time – the names can be different, but it’s still the same person. 304 18Cr-8Ni As a widely used steel, it possesses good corrosion resistance, heat resistance, low-temperature strength, and mechanical properties ； It has good hot workability for stamping, bending, etc., and shows no hardening due to heat treatment (non-magnetic, suitable for temperatures ranging from -196°C to 800°C). Household items (tableware of categories 1 and 2, cabinets, indoor piping, water heaters, boilers, bathtubs), auto parts (windshield wipers, mufflers, molded products), medical devices, building materials, chemicals, food industry, agriculture, ship components. 304L 18Cr-8Ni-low carbon: As a low-C version of 304 steel, under normal conditions its corrosion resistance is similar to that of 304 steel; however, after welding or stress relief, it exhibits excellent resistance to intergranular corrosion ； It maintains good corrosion resistance even without heat treatment, and can be used at temperatures ranging from -196°C to 800°C. Applied to field open-air machinery in the chemical, coal, and petroleum industries where high resistance to intergranular corrosion is required, as well as to heat-resistant components in building materials and components for which heat treatment is difficult. 316 18Cr-12Ni-2.5Mo Due to the addition of Mo, it possesses excellent corrosion resistance, resistance to atmospheric corrosion, and high-temperature strength, allowing it to be used in harsh conditions ； Excellent work hardening property (non-magnetic). Equipment used in seawater for producing items via chemicals, dyes, papermaking processes, oxalic acid, fertilizers, and other means ； Photography, food industry, facilities in coastal areas, ropes, CD poles, bolts, nuts. 316L 18Cr-12Ni-2.5Mo low-carbon: As the low-C variant of the 316 steel series, it possesses the same properties as 316 steel, in addition to having improved resistance to intergranular corrosion. Among the applications of 316 steel, there are products that require special resistance to intergranular corrosion.