JB/T 6880.1-2013 English PDF (JBT6880.1-2013)

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JB/T 6880.1-2013: Grey iron castings for pumps
JB/T 6880.1-2013
JB
MECHANICAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 23.080
J 71
Filing No.: 44389-2014
Replacing JB/T 6880.1-1993
Grey iron castings for pumps
ISSUED ON: DECEMBER 31, 2013
IMPLEMENTED ON: JULY 01, 2014
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Designations ... 5
5 Technical requirements ... 5
6 Test methods ... 10
7 Inspection rules ... 11
8 Marking, packaging, storage, transportation of castings ... 13
Appendix A (Normative) Welding repair of gray cast iron parts for pumps... 14
Grey iron castings for pumps
1 Scope
This standard specifies the terms and definitions, designations, technical requirements,
test methods, inspection rules, casting markings, packaging, storage and transportation
requirements of gray iron castings for pumps (hereinafter referred to as castings).
This standard applies to gray iron castings for pumps, which are cast in sand molds or
molds with thermal conductivity equivalent to sand molds, where there are no special
requirements for repair welding in drawings or other technical documents. Gray iron
castings for pumps as cast in other molds can also be used for reference.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 5611 Foundry terminology
GB/T 6060.1 Surface roughness comparison specimen - Part 1: Casting surface
GB/T 6414-1999 Castings - System of dimensional tolerances and machining
allowances
GB/T 9439-2010 Gray iron castings
GB/T 11351-1989 Mass tolerances for castings
JB/T 5413 Acceptance specification for mixed and axial flow pumps with open
blades
JB/T 6879 Dimensional tolerances of wet surfaces in the castings of centrifugal
pumps
3 Terms and definitions
The terms and definitions as defined in GB/T 5611, as well as the following terms and
definitions, apply to this document.
3.1
Shift value
The difference between one part of the casting and another part at the parting surface,
due to misalignment during assembly.
4 Designations
The cast iron designations shall comply with the provisions of Chapter 4 of GB/T 9439-
2010.
5 Technical requirements
5.1 Production method and chemical composition
The production method and chemical composition shall comply with the provisions of
6.1 and 6.2 of GB/T 9439-2010.
5.2 Mechanical properties
The mechanical properties shall comply with the provisions of 7.1 of GB/T 9439-2010.
5.3 Metallographic structure
The metallographic structure shall comply with the provisions of 7.2 of GB/T 9439-
2010.
5.4 Heat treatment
Castings shall be subjected to stress relief annealing treatment. The specific
requirements shall be agreed upon by the supplier and the buyer.
5.5 Geometric shape and size
The geometric shape and size of the casting shall comply with the requirements of the
drawing.
5.6 Dimensional tolerance
5.6.1 The dimensional tolerance of general parts shall not be less than that specified in
Table 1; the tolerance zone shall be set symmetrically to the basic size of the casting.
5.6.2 When the dimensional tolerance specified in Table 1 cannot meet the requirements
OR when the casting is a small batch or a single piece and it must consider economic
factors, it shall be specified separately in the drawing or the agreement agreed by both
6.8 Casting defects
The inspection of casting defects shall be carried out in accordance with the provisions
of 7.8 of GB/T 9439-2010.
6.9 Inspection of special requirements
The inspection of special requirements shall be carried out in accordance with the
provisions of 5.12 of this standard, in accordance with the agreement or relevant
provisions agreed upon by the supplier and the buyer.
6.10 Inspection of defect welding repair
The inspection of welding repair of casting defects shall comply with the provisions of
Appendix A.
7 Inspection rules
7.1 Inspection rights
The inspection rights shall be carried out in accordance with the provisions of 10.1 of
GB/T 9439-2010.
7.2 Inspection location
The inspection location shall be carried out in accordance with the provisions of 10.2
of GB/T 9439-2010.
7.3 Division of sampling batches
The division of sampling batches shall be carried out in accordance with the provisions
of 10.3 of GB/T 9439-2010.
7.4 Inspection items
The inspection items are:
a) The tensile test shall be carried out in accordance with the provisions of 9.1 of
GB/T 9439-2010;
b) The hardness test shall be carried out in accordance with the provisions of 9.2 of
GB/T 9439-2010;
c) The metallographic examination shall be carried out in accordance with the
provisions of 9.6 of GB/T 9439-2010.
7.5 Evaluation of test results
The evaluation of test results shall be carried out in accordance with the provisions of
10.5 of GB/T 9439-2010.
7.6 Inspection of geometric shape and size
The geometric shape and size of the casting shall be inspected according to the drawings.
The first batch of castings and important parts shall be inspected piece by piece
according to the drawings. General castings and castings produced by the method of
ensuring dimensional stability can be spot checked; the sampling method shall be
agreed upon by the supplier and the buyer.
7.7 Dimensional tolerance of castings
The dimensional tolerance of castings shall be inspected in accordance with the
requirements of 5.6. The inspection rules shall be implemented in accordance with the
provisions of 7.6.
7.8 Shift value
The shift value shall be inspected piece by piece according to the requirements of 5.7.
7.9 Machining allowance
The machining allowance shall be inspected according to the requirements of 5.8. The
inspection rules shall be implemented in accordance with the provisions of 7.6.
7.10 Weight
The weight and weight tolerance of castings shall be spot checked in accordance with
the requirements of 5.9.
7.11 Surface quality
The surface quality shall be inspected piece by piece according to the requirements of
5.10 of this standard. The surface roughness inspection of castings shall be implemented
in accordance with the provisions of GB/T 6060.1.
7.12 Defect inspection
The inspection of casting defects shall be carried out piece by piece according to the
requirements of 5.11.
7.13 Special inspection
The inspection of special requirements shall be carried out piece by piece according to
the requirements of 5.12.
7.14 Welding repair inspection
Appendix A
(Normative)
Welding repair of gray cast iron parts for pumps
A.1 General
This Appendix specifies the welding repair method, welding repair procedure, welding
repair inspection of gray cast iron parts for pumps (hereinafter referred to as castings).
This Appendix is applicable to gray cast iron parts for pumps, that have no special
provisions or special requirements for welding repair in drawings or other technical
documents. Welding repair of ductile iron parts for pumps can also make reference to
this Appendix.
A.2 Welding repair permit conditions
A.2.1 When a casting...