JB/T 6887-2004 English PDF (JBT6887-2004)

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JB/T 6887-2004: Technical condition of cast iron for fans blower and compressor
JB/T 6887-2004
JB
NATIONAL STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 23.120
J 72
Replacing JB/T 6887-1993, JB/T 6889-1993
Technical condition of cast iron
for fans blower and compressors
ISSUED ON. OCTOBER 20, 2004
IMPLEMENTED ON. APRIL 1, 2005
Issued by. National Development and Reform Commission, People's
Republic of China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Technical requirements ... 6 
4 Test methods and inspection rules ... 18 
5 Mark and certificate ... 20 
6 Rejection ... 21 
Annex A (Normative) The pattern drawing slope of casting wood appearance
(JB/T 5105) ... 22 
Annex B (Normative) Casting machining allowances (RMA) (GB/T 6414) ... 23 
Annex C (Normative) Casting dimensional tolerances (GB/T 6414) ... 24 
Annex D (Normative) Casting weight tolerance grade values (GB/T 11351) .. 25 
Foreword
This Standard is a revision to JB/T 6887-1993 Technical Condition of Cast Iron
for Fans Blower and Compressors.
This Standard made modification on normative references and added relevant
content. In technical content and writing format, it made necessary modification
to the previous edition.
Compared with JB/T 6887-1993, the main changes in this Standard are as
follows.
- merged the main content of JB/T 6887-1993 Technical Condition of Cast
Iron for Fans Blower and Compressors into this Standard;
- re-specified that dimensional tolerances of casting and the level of
machining allowance shall be in accordance with Gb/T 6414-1999, which
improved quality level;
- the provisions on casting weight tolerance shall be in accordance with
MT13 of GB/T 11351-1989; the only 7% weight deviation is not used;
- made higher requirements for channels of fans blower and compressors
and external surface quality, so as to meet requirements of market for
product quality;
- in the defect welding range, made a new division on casting classification;
the one with the weight greater than 6300 kg is called as extra large piece
to make casting of fans blower and compressors to meet the needs of
large-scale development;
- as the new process of vibration aging matures, this Standard, for the first
time, specified that it is equivalent with annealing method for eliminating
internal stress;
- made further specific provisions on bearing boxes, gearbox and other
casting kerosene test and casting primer coating for implementation;
- made a large deletion on welding process of original cast iron;
- Annex B is in accordance with the new machining allowance level value
listed in GB/T 6414-1999 and added Annex D “Casting weight tolerance
level value”.
Annex A, Annex B, Annex C, Annex D of this Standard are normative.
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of National Technical Committee
on Fans Blower and Compressors of Standardization Administration of China.
The drafting organizations of this Standard. Shaanxi Blower (Group) Co., Ltd.,
Shenyang Blower (Group) Co., Ltd.
Main drafters of this Standard. Wang Kuiwang, Song Lili.
Versions of standard substituted by this Standard are.
- JB/T 6887-1993;
- JB/T 6889-1993.
Technical condition of cast iron
for fans blower and compressors
1 Scope
This Standard specifies the technical requirements, test methods and
acceptance rules of cast iron for fans blower and compressors.
This Standard is applicable to gray cast iron, ductile iron and the hammer wear-
resistant ductile iron, high-silicon corrosion-resistant cast iron, cast iron and
other alloyed cast irons used for turbines, blowers, compressors, expanders,
Roots, Yip blowers (hereinafter referred to as casting).
2 Normative references
The following standards contain the provisions which, through reference in this
Standard, constitute the provisions of this Standard. For dated references,
subsequent amendments (excluding corrections) or revisions do not apply to
this Standard. However, the parties who enter into agreement based on this
Standard are encouraged to investigate whether the latest versions of these
documents are applicable. For undated reference documents, the latest
versions apply to this Standard.
GB/T 223.3~78, Methods for chemical analysis of iron, steel and alloy
GB/T 228, Metallic materials - Tensile testing at room temperature (GB/T
228-2002, eqv ISO 6892.1998 (E))
GB/T 229, Metallic Charpy notched impact test (GB/T 229-1994, eqv ISO
148.1983)
GB/T 230, Metallic materials - Rockwell hardness test (GB/T 230-1991, neq
ISO 6508.1986)
GB/T 231.1~3, Metallic materials - Brinell hardness test method
GB/T 1348, Spheroidal graphite iron castings
GB/T 3180, Specification for medium manganese wear-resistant spheroidal
iron castings
GB/T 6060.1, Roughness comparison specimens - Cast surfaces (GB/T
6060.1-1997, eqv ISO 2632-3.1979)
GB/T 6414, Castings - System of Dimensional Tolerances and Machining
Allowances (GB/T 6414-1999, eqv ISO 8062.1994)
GB/T 7216, Metallographic test for gray cast iron (neq ISO 945.1975)
GB/T 8491, Corrosion resistant high silicon iron castings
GB/T 9437, Heat resistant iron castings
GB/T 9439, Grey iron castings
GB/T 9441, Metallographic test for spheroidal graphite cast iron
GB/T 11351, Mass tolerances for castings
GB/T 15056, Evaluation method on cast surface roughness
JB/T 5926, Vibrating stress relief effect-Evaluation methods
JB/T 6886, Technical specification for draught fan application
JB/T 7699, Technical specifications for wooden model and core box for
foundry
JB/T 7945, Methods for testing the mechanical properties of grey cast iron
3 Technical requirements
3.1 Materials
All types of cast irons in this Standard shall use the material designations which
comply with the provisions of GB/T 9439, GB/T 1348, GB/T 9437, GB/T 8491,
GB/T 3180.
3.2 Production method and heat treatment
Casting should be annealed or use vibration aging method to eliminate internal
stress. The production method and heat treatment of castings shall be decided
by the supplier. However, it must satisfy the designation specified in this
Standard and relevant technical performances. The repeated heat treatment of
adjusting mechanical properties and processing properties must not exceed
twice. If it uses vibration aging, it shall strictly follow the provisions of JB/T 5926.
When there are special requirements for heat treatment and internal stress
elimination, it shall indicate in drawing or order agreement.
3.3 Mechanical properties and chemical composition
3.5.1 General
The geometrical shape and dimensions of castings shall comply with the
pattern or appearance when ordering and relevant agreement. The wood mold
should be implemented according to the second grade of precision of JB/T 7699.
The pattern draft not specified in the process shall comply with the provisions
of Annex A.
3.5.2 Casting machining allowance
3.5.2.1 If there is no special requirements for drawing, order agreement,
casting bottom and side machining allowance shall be implemented according
to H grade provisions of GB/T 6414-RMA (see Annex B). The top surface
machining allowance is 0.25 times of the corresponding bottom surface.
3.5.2.2 The purchaser shall specify on the drawings the surface to be pre-
machined by the foundry and the machining allowance required for the final
machining, in order to achieve t...