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Distributor's Link Magazine Fall 2020 / Vol 43 No 4


102 THE DISTRIBUTOR’S LINK GUY AVELLON WHAT FASTENER DISTRIBUTORS NEED TO KNOW ABOUT IDENTIFYING STAINLESS STEEL from page 10 Those manufacturing to the F593 specifications for general use and corrosion resistance will have ‘F593’ on the head followed by a letter: F593C or F593D, which refers to type 304. The letter suffix identifies the material condition and size range of the fastener. The F593C denotes the material condition of CW for the stainless alloy Group 1 consisting of; 303, 304, 304L, 305, 384, XM1, 18-9LW, 302HQ, 304J3 and 303Se in diameters from 1/4” through 1 1/2” and a full-sized tensile strength range of 100 to 150 ksi and a yield strength of 65 ksi. The F593D is of the same alloy Group 1, also with a material condition of CW, in sizes 3/4” through 1 1/2” diameters. The full-sized tensile strength range is 85 to 140 ksi and the yield strength is at 45 ksi. The F593G and F593H denotes type 316, 316L in alloy Group 2. Both are in the CW condition, the G suffix is for product diameters 1/4” through 5/8”, a full-sized tensile strength range of 100 to 150 ksi and a yield strength of 95 ksi. The H suffix denotes diameters from 3/4”through 1 1/2”, a full-sized tensile strength of 85 to 140 ksi and yield strength of 45 ksi. The ‘Condition’ of Stainless Steels Condition A denotes annealed material that was machined or hot formed from solution-annealed stock to retain the properties of the original material. The tensile and yield strengths are relatively low, 75 to 100 ksi and 30 ksi respectively, but % elongation is higher than others. Condition A will have a suffix of B, F, K, or N. Condition AF is product that was headed and rolled from annealed stock, then reannealed. The full-sized tensile strength of the Austenitic alloy ranges from 65 to 85 ksi, yield at 20 ksi and machined elongation at 40% for F593A, F593E and F593J. The Ferritic alloys of F593X have a tensile strength range of 55 to 75 ksi with yield at 30 ksi. Condition AH represents solution annealed and age hardened material after forming. This treatment is for Precipitation Hardening alloys, Alloy Group 7, F593U and exhibits a tensile strength range of 135 to 170 ksi, yield strength of 105 ksi and elongation of 16%. Condition CW denotes annealed stock that has been headed and rolled which produces a certain degree of cold working of the material during manufacturing. Sizes 3/4” and larger may be hot worked and solution-annealed. Austenitic alloys F593C, F593D, F593G, F593H, F593L and F593M) will produce tensile strengths of 100 to 150 ksi and 85 to 140 ksi, depending upon product diameter, the yield strengths range from 65 to 45 ksi also depending upon the product diameter. The tensile strength of the Ferritic alloys F593V is from 60 to 105 ksi, yield strength of 40 ksi, for diameters 1/4” through 5/8” and F593W from 55 to 100 ksi, yield strength at 30 ksi for diameters 3/4” through 1 1/2”. Condition H is a condition for the Martensitic alloys which are hardened and tempered at 1050º F (565ºC). Alloy Group 5 (410, 416, 416 Se) F593P produces a tensile strength range of 110 to 140 ksi for diameters 1/4” through 1 1/2”, a yield strength of 90 ksi and elongation of 18% at a hardness of 20 to 30 HRC. Alloy Group 6 (431) F593S has a tensile strength from 125 to 150 ksi, yield strength of 100 ksi and elongation of 15% in sizes 1/4” through 1 1/2” at a hardness of 25 to 32 HRC. Condition HT is for product that is hardened and tempered at 525º (274ºC) minimum. This pertains to Martensitic alloys in Alloy Groups 5 and 6 where F593R has a tensile strength of 160 to 190 ksi, yield strength of 120 ksi, elongation of 12% for product diameters 1/4” through 1 1/2” at a hardness of 34 to 45 HRC. The F593T has a tensile strength from 180 to 220 ksi, yield strength of 140 ksi and a 10% elongation at a hardness of 40 to 48 HRC. Condition SH is for material machined from strain hardened stock or cold worked to develop specific mechanical properties. To differentiate these products from others, all of the head marked numbers are underlined, such as F593A. These alloys are in Alloy Group 1 but exhibit greater tensile strengths and yield strengths but lower % elongation than the non-underlined products. Therefore, careful distinctions between the two in applications must be observed. CONTINUED ON PAGE 149


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