GB/T 31931-2015 Active National standards

GB/T 31931-2015 Zinc or zinc alloy coating on steel sheets or strips—Determination of hexavalent chromium content—1,5-Diphenylcarbohydrazide(diphenylcarbazide) spectrophotometric method

Publish Date: 2015-09-11 Implement Date: 2016-06-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

Basic Information

Standard Code: GB/T 31931-2015

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Analysis methods for steel and iron alloys

ICS Name: Black metal comprehensive

Publish Date: 2015-09-11

Implement Date: 2016-06-01

Pages: 6 pages

Scope

This standard specifies the method for determining the content of hexavalent chromium using the spectrophotometric method of diphenylcarbodiimide.
This standard is applicable to the determination of the content of hexavalent chromium on the surface of steel plates and steel strips coated with zinc and zinc alloys, including pure zinc, zinc-iron alloys, zinc-aluminum, and aluminum-zinc alloys. The measurement range is: 2 μg/g to 100 μg/g or 0.020 μg/cm2 to 10 μg/cm2.

Development Information

Word Count: 10 Thousand words Pages: 6 pages

Referenced Standards

GB/T 1839-2003 Test method for gravimetric determination of the mass per unit area of galvanized coatings on steel products GB/T 1839-2008 Test method for gravimetric determination of the mass per unit area of galvanized coatings on steel products GB/T 6682-1992 Water for analytical laboratory use—Specification and test methods GB/T 6682-2008 Water for analytical laboratory use—Specification and test methods GB/T 7729-2021 Chemical analysis of metallurgical products—General rule for spectrophotometric methods GB/T 1839-2025 Test method for gravimetric determination of the mass per unit area of galvanized coatings on steel products

Related Standards

GB/T 17616-1998 Replaced

GB/T 17616-1998 Unified numbering system for designations of iron,steel and alloy

Publish Date: 1998-12-14

GB/T 5686.4-1998 Replaced

GB/T 5686.4-1998 Methods for chemical analysis of silicomanganese—The phosphomolybdenum blue phtometric method for the determination of phosphorus content

Publish Date: 1998-12-14

GB/T 18255-2000 Replaced

GB/T 18255-2000 Coking viscous oil products—Determination of distillation range

Publish Date: 2000-11-17

GB/T 4223-2004 Replaced

GB/T 4223-2004 Iron and steel scraps

Publish Date: 2004-05-20

GB/T 20066-2006 Active

GB/T 20066-2006 Steel and iron—Sampling and preparation of samples for the determination of chemical composition

Publish Date: 2006-02-05

GB/T 11261-2006 Active

GB/T 11261-2006 Steel and iron—Determination of oxygen content—The pulse heating inert gas fusion-infra-red absorption method

Publish Date: 2006-03-02