C10

ISO 683-18:1996 Bright non-alloy and low-alloy steel products, Table 3 Heat analysis of carburizing steels, mass fraction wt%; This is not a composition confirmation of the 2014 edition. ; This source is a 13-page public excerpt from the official version; complete composition rows and 5 footnotes from Table 3 have been obtained.; Without Table 4 product-analysis tolerances, Tables 7/8 hardenability data and Chapter 8 compositions of steels for quenching and tempering, verification of the entire standard must not be claimed complete.. ; Currently displaying the range for common grades in Table 3. When hardenability requirements are specified, Footnote 1 allows limited deviations except for P/S, with C not exceeding ±0.01% and other elements subject to Table 4; The absence of Table 4 shall not automatically relax ranges, nor shall it be used for the acceptance of H grades. ; Machinability may be improved by adding lead or controlling sulfide shape upon request; Where lead values are not specified, they shall not be filled as zero or assigned an arbitrary range. ; For other carburizing steels, see ISO 683-11:1987; Different suffix names in the 2014 edition shall not be automatically regarded as the same grade in the 1996 edition. ; A lower Si may be agreed upon during inquiry and ordering, provided the impact on mechanical properties is considered; The base ranges in Table 3 are currently used; do not remove the Si lower limit arbitrarily.. ; Elements not listed in the table must not be assumed to have zero content.; Unlisted elements shall not be intentionally added without the buyer's consent (except additions needed to finish steelmaking), and elements affecting properties introduced via scrap steel etc. shall be prevented. ; Clause 7.2.2.1 stipulates that Table 3 is used for heat analysis; Product-analysis tolerances are given in Table 4, which has not been obtained.. Clause 5.1.2 requires killed steel. Carbide spheroidizing annealing conditions required for cold-heading/cold-extrusion are covered separately by ISO 4954; cold-heading applicability cannot be determined solely by composition.

Q/BQB 130—2003 is a standard for slabs produced by initial rolling for subsequent rerolling. The finished plate thickness in Table 3 means the plate thickness after rerolling the slab, not slab thickness or wire diameter. Table 3 gives ladle analysis in mass fraction wt%; C = capped steel, A = aluminium-killed steel, G = aluminium-silicon-killed steel, K = silicon-killed steel. Read the applicable condition row; unlisted elements are not assumed to be zero. Note 3 to Table 3 requires slabs for thick plate (finished thickness ≥15 mm) to use G aluminium-silicon-killed steel; buyer and supplier must verify applicability of rows involving other deoxidation methods. Product-analysis tolerances for killed steel are separately governed by GB/T 222 and must not be mixed with Table 3 ladle-analysis values.