![]() I presume & hope "carbon content exceeds 0.4%" is a typo and that you really meant 0.04% C. Elongation decreases rapidly as hardness & YS increase, from 40% for F593A (hardness B85 max) to 12% for F593A (HRC36 max).ĪSTM A593, Table 3, indicates that elongation testing isn't mandatory for all grades, so a maximum hardness limit is a de facto minimum elongation limit. I suspect that the hardness limits are a safety factor, to preserve an amount of elongation. 18-8 Stainless Steel Threaded RodsGrade B8 Grade B8 threaded rods meet the pressure and temperature requirements of ASTM A193 and are often used to secure pressure tanks, valves, and flanges. 18/8 stainless steel means the composition of stainless steel containing 18 chromium and 8 nickel. 18.8 stainless steel benefits from increased resistance to. 18.8 stainless steel also offers a tensile strength range of 80-200,000 psi and good corrosion resistance. 18-8 stainless steel contains approximately 18 chromium and 8 nickel. 300 series stainless steel has approximately 18 chromium, 8 nickel. *There are some additional, free-machining alloys permitted, but only with purchaser's agreement.ĪSTM A593 Alloy Group 1 has 8 subdivisions, with 3 having a hardness limit HRC32 (there are also 4 softer grades & 1 harder: max HRC36). 18.8 Stainless Steel is the most widely used austenite steel in the 300 series and is also known as the 304. ![]() Agree with you in general, but in this specific case, ASTM F593 has an Alloy Group 1 (304, 304L, 305, 384, 18-9LW, 302HQ)* corresponding to 18-8 compositions.
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