In 1941, the SAE Iron and Steel Division in collaboration with the american Iron and Steel Institute made a major change in the method of expressing composition ranges for the SAE steels. The plan, as now applied, is based in general on narrower ladle analysis ranges plus certain product (check) analysis allowances on individual samples, in place of the fixed ranges and limits without tolerances formerly provided for carbon and other elements in SAE steels (reference J408). To avoid the possibility of confusion and conflict between SAE and AISI steel designations, all proposed changes in compositions, additions, or deletions of numbers will be coordinated between the two organizations. The compositions in this SAE Standard may apply to open hearth and basic oxygen, or electric furnace steels. Grades shown in Table 1A and 1B with prefix letter E are normally made by the electric furnace process with maximum limits of 0.025% phosphorus and 0.025% sulfur. The nominal chemical limits or ranges in the compositions given in Table 1A are subject to standard variations in check analysis given in SAE J409. Table 1A is applicable to billets, blooms, slabs, and hot-rolled and cold- finished bars. This table is applicable also to wire rods, but there are additional grades in SAE J1249 Table 1 (refer to footnote 3) which also are standard for wire rods. SAE J404 is not applicable to the following product forms: a. structural shapes -- not normally furnished to ally chemistries; b. sheet and strip, hot- rolled and cold-rolled -- refer to ASTM A 506 and A 507; and c. seamless and welded mechanical tubing -- refer to aSTM A 513 and A 519.