Standard No.:	GB 222-1984
English Name:	Method of sampling steel for determination of chemical composition and permissible variations for product analysis
Chinese Name:	钢的化学分析用试样取样法及成品化学成分允许偏差
Chinese Classification:	H11    Steel and iron alloy analysis method
Professional Classification:	GB    National Standard
ICS Classification:	77.080.20 77.080.20    Steels 77.080.20
Issued by:	China Steel Industry Association
Issued on:	1983-12-08
Implemented on:	1984-12-7
Status:	superseded
Superseded by:	GB/T 222-2006 Permissible Tolerances for Chemical Composition of Steel Products GB/T 20066-2006 Steel and Iron-Sampling and Preparation of Samples for the Determination of Chemical Composition
Superseded on:	2006-8-1
Superseding:	GB 222-1963
Language:	English
File Format:	PDF
Word Count:	3000 words
Price(USD):	60.00
Delivery:	via email in 1 business day

1 Terms



1.1 Melting analysis

Melting analysis refers to taking sample ingot during pouring molten steel and then making it into sample for chemical analysis. The analysis result represents the average chemical composition of the same furnace or tank of molten steel.

1.2 Product analysis

Product analysis refers to taking sample from the processed finished steel (including steel billet) for chemical analysis. Product analysis is mainly used for checking the chemical composition, so it is also known as check analysis. As a result of uneven distribution (segregation) of element produced in the crystallization process of molten steel, the value of product analysis is different from that of melting analysis.

1.3 Permissible variation for product analysis

Permissible variation for product analysis refers to that the value of melting analysis is within the standard scope but the value of product analysis may beyond the standard composition scope due to the element segregation in steel. A specified permissible value beyond this scope is namely the permissible variation for product analysis.



2 Sampling General