4.1 These test methods for the chemical analysis of chromium metal and ferrochromium alloy are primarily intended to test such materials for compliance with compositional specifications such as Specifications A101 and A481. It is assumed that all who use these test methods will be trained analysts capable of performing common laboratory procedures skillfully and safely. It is expected that work will be performed in a properly equipped laboratory.

1.1 These test methods cover the chemical analysis of chromium and ferrochromium having chemical compositions within the following limits:

Element

Composition, %

Aluminum

0.25 max

Antimony

0.005 max

Arsenic

0.005 max

Bismuth

0.005 max

Boron

0.005 max

Carbon

9.00 max

Chromium

  51.0 to 99.5

Cobalt

0.10 max

Columbium

0.05 max

Copper

0.05 max

Lead

0.005 max

Manganese

0.75 max

Molybdenum

0.05 max

Nickel

0.50 max

Nitrogen

6.00 max

Phosphorus

0.03 max

Silicon

12.00 max

Silver

0.005 max

Sulfur

0.07 max

Tantalum

0.05 max

Tin

0.005 max

Titanium

0.50 max

Vanadium

0.50 max

Zinc

0.005 max

Zirconium

0.05 max

1.2 The analytical procedures appear in the following order:

Sections

Arsenic by the Molybdenum Blue Spectrophotometric Test Method
 [0.001 % to 0.005 %]

10 – 20

Lead by the Dithizone Spectrophotometric Test Method
 [0.001 % to 0.05 %]

21 – 31

Chromium by the Sodium Peroxide Fusion-Titrimetric Test Method
 [50.0 % to 99.5 %]

32 – 38

1.3 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific hazard statements are given in Section 6 and in special “Warning” paragraphs throughout these test methods.

1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.