GB/T 21471-2008: Machining allowances and tolerances for steel open die forgings on hammer -- Shafts

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Scope

This Standard specifies the machining allowances and tolerances of open die forgings such as
shafts without steps, shafts with steps, and single throw crankshaft, as well as the allowable
limit deviations of forging without machining.
This Standard applies to open die forgings of carbon steel and alloy steel with a carbon content
not exceeding 0.9% and a total content of other alloy components not exceeding 4%.
For open die forgings that exceed the range specified in this Standard, the allowances and
tolerances shall be determined by negotiation between the supplier and the purchaser.

Basic Data

Standard ID	GB/T 21471-2008 (GB/T21471-2008)
Description (Translated English)	Machining allowances and tolerances for steel open die forgings on hammer -- Shafts
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	J32
Classification of International Standard	77.140.85
Word Count Estimation	14,154
Date of Issue	2008-02-28
Date of Implementation	2008-08-01
Older Standard (superseded by this standard)	GB/T 15826.6-1995; GB/T 15826.7-1995; GB/T 15826.8-1995; GB/T 15826.9-1995
Quoted Standard	GB/T 21469; JB/T 9179.2; JB/T 9179.3
Regulation (derived from)	National Standard Approval Announcement 2008 No.3 (Total No.116)
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This standard specifies the optical axis, stepped shaft combined single- throw crankshaft forgings mechanical allowances and tolerances, as well as black forgings allowable limit deviations. This standard applies to open die forgings up to 0. 9% carbon content and other alloying elements does not exceed 4% of the total content of carbon steel and alloy steel. Where forgings beyond the scope of this standard, tolerance shall be negotiated with the remaining amount is determined by the supply and demand sides.