SA-516
6. Chemical Requirements
6.1 The steel shall conform to the chemical requirements
shown in Table 1 unless otherwise modified in
accordance with Supplementary Requirement S17, Vacuum
Carbon-Deoxidized Steel, in Specification
A 20/A 20M.A 20/A 20M

A20
.7. Chemical Composition
7.1 Heat Analysis
7.1.1 Sampling for chemical analysis and methods
of analysis shall be in accordance with Test Methods,
Practices, and Terminology A 751.
7.1.2 For each heat, the heat analysis shall include
determination of the content of carbon, manganese, phosphorus,
sulfur, silicon, nickel, chromium, molybdenum,
copper, vanadium, columbium; any other element that is
specified or restricted by the applicable product specification
for the applicable grade, class, and type; aluminum,
if the aluminum content is to be used in place of austenitic
grain size testing of the heat (see 8.2.2.1); and any other
austenitic grain refining element for which limits are specified
in the purchase order (see 8.2.4).
7.1.3 Heat analyses shall conform to the heat analysis
requirements of the applicable product specification
for the applicable grade, class, and type. In addition, for
elements that are listed in Table 1 but are not specified
or restricted in the applicable product specification for
the applicable grade, class, and type, heat analyses shall
conform to the applicable heat analysis limits given in
Table 1.

TABLE 1
LIMITS ON ELEMENTS (SEE 7.1.3 and 7.2.4)
Copper, max. %A Heat analysis 0.40
Product analysis 0.43
Nickel, max. %A Heat analysis 0.40
Product analysis 0.43
Chromium, max. %A,B Heat analysis 0.30
Product analysis 0.34
Molybdenum, max. %A,B Heat analysis 0.12
Product analysis 0.13
Vanadium, max. %C Heat analysis 0.03
Product analysis 0.04
Columbium, max. %D Heat analysis 0.02
Product analysis 0.03
Titanium, max. %E Heat analysis 0.03
Product analysis 0.04"

In the absence of specific information for the specific material in question, always refer back to the general specification for that missing information.

Regards,
Gerald