JB/T 10384-2002 English PDF (JB/T10384-2002)

Delivery: 3 seconds. Download true-PDF + Invoice.
Get Quotation: Click JB/T 10384-2002 (Self-service in 1-minute)
Historical versions (Master-website): JB/T 10384-2002
Preview True-PDF (Reload/Scroll-down if blank)

JB/T 10384-2002: Steel castings for water passage components of small and medium sized hydraulic turbines
GB/T 10384-2002
JB
MACHINERY INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 29.140
K 55
JB/T 10384-2002
Steel castings for water passage components of small and
medium sized hydraulic turbines
ISSUED ON: DECEMBER 27, 2002
IMPLEMENTED ON: APRIL 01, 2003
Issued by: State Economic and Trade Commission of the People's Republic of
China
Table of Contents
Foreword ... 3
Introduction ... 4
1 Scope ... 5
2 Normative references ... 5
3 Ordering requirements ... 6
4 Technical requirements ... 6
4.1 Manufacturing process ... 6
4.2 Chemical composition ... 7
4.3 Mechanical properties ... 8
4.4 Casting defects and welding repairs ... 8
4.5 Casting surface quality ... 10
5 Inspection rules ... 19
5.1 Chemical composition analysis ... 19
5.2 Mechanical properties inspection ... 19
5.3 Nondestructive testing ... 20
6 Reinspection ... 22
7 Quality certificate ... 22
8 Marking, packaging and transportation ... 22
Steel castings for water passage components of small and
medium sized hydraulic turbines
1 Scope
This Standard specifies the ordering, manufacturing, testing methods and inspection
and acceptance rules for steel castings used in flow-through components of small and
medium-sized turbines.
This Standard is applicable to small and medium-sized Francis, axial, tubular and Pelton
turbine steel castings. For other types of turbine steel castings, it may be used as
reference.
2 Normative references
The following documents contain the provisions which, through reference in this
Standard, become the provisions of this Standard. For dated references, their
subsequent amendments (excluding corrigendum) 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 222-1984, Method of sampling steel for determination of chemical
composition and permissible variations for product analysis
GB/T 223.3~78, Chemical analysis methods for steel and alloys
GB/T 228-2002, Metallic materials -- Tensile testing at ambient temperature (eqv
ISO 6892:1998)
GB/T 229-1994, Metallic materials -- Charpy pendulum impact test method (eqv
ISO 148:1983)
GB/T 231-1984, Metallic materials -- Brinell hardness test
GB/T 2100-2002, Corrosion-resistant steel castings for general applications
GB/T 5677, Methods of radiographic testing and classification of radiographs for
steel castings
GB/T 6397-1986, Metallic materials -- Test pieces for tensile testing
GB/T 6414, Castings -- Dimensional tolerances and geometrical tolerances and
machining allowances (eqv ISO 8062:1994)
GB/T 6967-1986, Medium and high strength stainless steel castings for engineering
structure purposes
GB/T 7233, Methods for ultrasonic testing and for specifying quality levels of steel
castings
GB/T 9443, Methods of liquid penetrant testing and classification of indication for
steel castings
GB/T 9444, The methods for magnetic particle testing and for specifying quality
levels of steel castings
GB/T 10969-1996, Specifications for water passage components of hydraulic
turbines (neq IEC 193-1:1977)
GB/T 11351, Mass tolerances for castings
GB/T 11352-1989, Carbon steel castings for general engineering purposes
3 Ordering requirements
3.1 The supplier and the purchaser shall specify the name of the casting, implementation
standard, material designation, order quantity and supply status in the order contract
and order agreement.
3.2 The ordering party must provide the supplier with the order drawing and indicate
the product size, tolerance, surface roughness and test items, etc.
3.3 When inquiring and placing orders, the supplier and the purchaser negotiate to
determine the location and quantity of the test blocks, as well as the method, location
and level of non-destructive testing.
3.4 When inquiring and placing orders, the supplier and the purchaser negotiate to
determine the mold line detection method, which can refer to GB/T 10969-1996, but
the impact of grinding and machining allowance on the casting blank shall be
considered.
4 Technical requirements
4.1 Manufacturing process
4.1.1 Smelting
When inquiring and placing orders, the supplier and purchaser shall negotiate and
determine whether to use one of the methods such as medium frequency furnace,
electric arc furnace, refining, etc. or a combination of methods for smelting. If the
ordering party has no special requirements, the supplier can decide on his own.
4.1.2 Heat treatment
Steel castings must be heat treated. Unless otherwise agreed upon at the time of ordering,
the heat treatment process is determined by the supplier. Commonly used heat treatment
processes are one of the following:
4.1.2.1 Carbon steel
a) Annealing:
b) Normalizing;
c) Normalizing and tempering.
4.1.2.2 Low alloy steel
a) Annealing;
b) Normalizing and tempering.
4.1.2.3 Martensitic stainless steel
Normalizing and tempering.
The number of repeated normalizing shall be agreed upon by both parties during the
inquiry and ordering. If the ordering party has no special requirements, it shall be
decided by the supplier. There is no limit to the number of tempering.
4.2 Chemical composition
The chemical composition shall be in accordance with GB/T 2100-2002, GB/T 6967-
1986, GB/T 11352-1989 and shall conform to the requirements of Table 1. When other
material designations are selected, they shall be in accordance with the order contract
between the supplier and the purchaser.
a) According to GB/T 9444, not less than level 3.
b) Surface of mixed flow runner blades.
c) Surface of axial flow and cross-flow runner blades, flange surface, and shaft head
surface.
d) Surface of bucket of water bucket runner.
e) Surface of guide vane body and shaft head surface.
5.3.1.2 Penetrant testing
a) According to GB/T 9443, not less than level 3.
b) Blade surface.
c) Water bucket surface, water bucket root.
d) Guide vane body surface, guide vane shaft head surface.
5.3.1.3 Ultrasonic flaw detection
a) According to GB/T 7233, longitudinal wave straight probe, sensitivity of Φ6 mm,
not less than level 3. When transverse wave oblique probe is required for flaw
detection, it shall be determined during inquiry and ordering.
b) The welding heat affected zone with a width of 0.04D2 is where the upper crown,
lower ring and blades of the mixed flow impeller intersect with the upper crown
and lower ring respectively.
c) The intersection between axial flow and cross-flow blades and flanges, flanges,
and shaft heads.
d) The intersection of the guide vane shaft neck and the guide vane plate body.
e) Pelton wheel hub.
5.3.1.4 Radiographic inspection
a) According to GB/T 5677, the sensitivity KA≤2.0%, not less than level 4.
b) For areas where ultrasonic testing cannot be determined or where both parties
have disagreements, if the geometric shape and other conditions allow,
radiographic testing shall be used for confirmation.
5.3.2 When inquiring and placing orders, if the ordering party has non-destructive
testing requirements, non-destructive testing shall be carried out on castings according
to the ordering party's requirements. But the testing location, testing method, area,
standard and level shall be specified. The different situations such as blank, rough
processing and fine processing shall be distinguished. Among them, the blank casting
testing requires grinding or processing the corresponding testing parts to achieve the
surface roughness required by the testing.
6 Reinspection
6.1 The ordering party has the right to re-inspect the supplied castings. The reinspection
items are the same as the inspection items in the ordering contract.
6.2 If the mechanical properties are unqualified, double the specimen shall be taken for
retest. If the retest is unqualified, the test block is allowed to be heat treated in the same
furnace as the casting and retested.
6.3 When non-destructive testing fails, it shall be handled in accordance with 4.4.3.
7 Quality certificate
When delivering the goods, the supplier shall provide the ordering party with a quality
certificate. According to the order contract, the quality certificate generally includes all
or part of the following contents:
a) Order contract number;
b) Order drawing number;
c) Casting name, material designation;
d) Melting furnace number, part number;
e) Chemical composition analysis results;
f) Standard number of the adopted standard;
g) Mechanical properties test results;
h) Non-destructive testing results;
i) Other additional test results;
j) Supplier factory (company) name.
8 Marking, packaging and transportation
8.1 The castings shall have the following markings: order contract number, drawing