GB/T 9437-2009 English PDF (GB/T9437-2009)

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GB/T 9437-2009: Heat resistant iron castings
GB/T 9437-2009
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.80
J 31
Replacing GB/T 9437-1988
Heat resistant iron castings
ISSUED ON: APRIL 01, 2009
IMPLEMENTED ON: DECEMBER 01, 2009
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Technical requirements ... 6
4 Test methods ... 8
5 Acceptance rules ... 11
6 Marks and quality certificates ... 14
7 Rust prevention, packaging and storage ... 14
8 Requirements of environmental protection, safety and laws and regulations ... 14
Annex A (informative) High temperature short time tensile strength of heat resistant
cast iron ... 16
Annex B (informative) Conditions of use and application examples of heat resistant cast
iron ... 17
Annex C (informative) U-type single casting test block ... 19
Annex D (informative) Test method for resistance to growth of heat resistant cast iron
... 21
Annex E (informative) Test method for anti-oxidation of heat resistant cast iron ... 24
Annex F (informative) Test method for thermal expansion coefficient ... 27
Heat resistant iron castings
1 Scope
This Standard specifies the technical requirements, test methods, inspection rules,
marks and quality certificates, anti-rust, packaging and storage requirements for heat
resistant iron castings.
This Standard is applicable to heat resistant iron castings cast in sand molds or molds
with similar thermal conductivity to sand molds and working at temperatures below
1100°C.
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments (excluding
corrigendum) or revisions do not apply to this Standard, however, parties who reach an
agreement based on this Standard are encouraged to study if the latest versions of these
documents are applicable. For undated references, the latest edition of the referenced
document applies.
GB/T 223.3, Methods for chemical analysis of iron, steel and alloy - The diantipyryl
methane phosphomolybdate gravimetric method for the determination of
phosphorus content
GB/T 223.8, Methods for chemical analysis of iron, steel and alloy - The sodium
fluoride separation - EDTA titration method for the determination of aluminum
content
GB/T 223.11, Iron, steel and alloy - Determination of chromium content - Visual
titration or potentiometric titration method
GB/T 223.12, Methods for chemical analysis of iron, steel and alloy - The sodium
carbonate separation-diphenyl carbazide photometric method for the determination
of chromium content
GB/T 223.26, Iron, steel and alloy - Determination of molybdenum content - The
thiocyanate spectrophotometric method
GB/T 223.28, Methods for chemical analysis of iron, steel and alloy - The α-benzoin
oxime gravimetric method for the determination of molybdenum content
GB/T 223.58, Methods for chemical analysis of iron, steel and alloy - The sodium
arsenate-sodium nitrite titrimetric method for the determination of manganese
content
GB/T 223.59, Iron, steel and alloy - Determination of phosphorus content - Bismuth
phosphomolybdate blue spectrophotometric method and antimony
phosphomolybdate blue spectrophotometric method
GB/T 223.60, Methods for chemical analysis of iron, steel and alloy - The perchloric
acid dehydration gravimetric method for the determination of silicon content
GB/T 223.61, Methods for chemical analysis of iron, steel and alloy - The
ammonium phosphomolybdate volumetric method for the determination of
phosphorus content
GB/T 223.64, Iron, steel and alloy - Determination of manganese content - Flame
atomic absorption spectrometric method
GB/T 223.68, Methods for chemical analysis of iron, steel and alloy - The potassium
iodate titration method after combustion in the pipe furnace for the determination of
sulfur content
GB/T 223.69, Iron, steel and alloy - Determination of carbon contents - Gas-
volumetric method after combustion in the pipe furnace
GB/T 228, Metallic materials - Tensile testing
GB/T 231.1, Metallic materials - Brinell hardness test - Part 1: Test method
GB/T 4338, Metallic materials - Tensile testing at elevated temperature
GB/T 5612, Code for representing cast iron
GB/T 5677, Castings - Radiographic testing
GB/T 5678, Sampling methods of spectrochemical analysis for cast alloys
GB/T 6060.1, Surface roughness comparison specimen - Part 1: Casting surface
GB/T 6414, Castings - Dimensional tolerances and geometrical tolerances and
machining allowances
GB/T 7216, Metallographic test for gray cast iron
GB/T 7233, Methods for ultrasonic testing and for specifying quality levels of steel
castings
GB/T 9441, Metallographic test method for spheroidal graphite cast iron
GB/T 9444, Steel and iron castings - Magnetic particle inspection
3.3 Surface quality
3.3.1 The surface roughness of castings shall meet the requirements of GB/T 6060.1.
The standard level is agreed upon by the supplier and the purchaser.
3.3.2 Castings shall be cleaned. Trim the excessive part. Remove the residue of the
pouring riser, the core bone, the sticky sand and the residue of the inner cavity. The
allowable riser residue, drape, flying spur residue, inner cavity cleanliness of the casting
shall comply with the purchaser's drawing, technical requirements or order agreement
between the supplier and the purchaser.
3.3.3 The shape, quantity, size and position of the allowable defects on the casting,
whether they can be repaired, and the method of repairing shall be agreed upon by the
supplier and the purchaser.
3.4 Mechanical properties
The mechanical properties of castings at room temperature shall meet the requirements
in Table 2. See Annex A for short-time high temperature tensile properties.
3.5 Heat treatment
Silicon-based and aluminum-based heat resistant ductile iron castings shall generally
undergo heat treatment to eliminate residual stress. However, when the silicon-
molybdenum heat resistant ductile iron castings have a pearlite content of less than 15%,
heat treatment is not required. For other designations, if required by the purchaser, the
heat treatment for eliminating residual stress shall be carried out according to the order
conditions.
See Annex B for the service conditions of heat resistant cast iron.
3.6 Metallographic structure
For the metallographic structure of heat resistant cast iron, refer to the provisions of
GB/T 9441 and GB/T 7216. The specific requirements shall be negotiated by both
parties. For silicon-based heat resistant cast iron, the matrix structure shall be mainly
ferrite.
3.7 Anti-oxidation, anti-growth properties and thermal expansion coefficient
At the service temperature, the average oxidation weight gain rate of heat resistant cast
iron is not greater than 0.5g/m2·h; the growth rate is not greater than 0.2%.
The anti-oxidation and anti-growth properties and thermal expansion coefficient of heat
resistant cast iron are not used as the basis for acceptance.
4.2.1 The room temperature mechanical property test of HTRCr, HTRCr2, HTRSi5 and
other designations, including the preparation of specimens, shall be carried out in
accordance with the provisions of GB/T 228.
4.2...