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QB/T 1924-1993 PDF in English


QB/T 1924-1993 (QB/T1924-1993, QBT 1924-1993, QBT1924-1993)
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QB/T 1924-1993: PDF in English (QBT 1924-1993)

QB/T 1924-1993
QB
INDUSTRY STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
QB/T 1924-93
Kitchen knifes
菜刀
ISSUED ON: JANUARY 06, 1994
IMPLEMENTED ON: AUGUST 01, 1994
Issued by: Ministry of Light Industry of PRC
Table of Contents
1 Subject content and scope of application ... 3 
2 Normative references ... 3 
3 Classification of products ... 3 
4 Technical requirements ... 4 
5 Test method ... 5 
6 Inspection rules ... 6 
7 Marking, packaging, transportation, storage ... 8 
Appendix A Requirements for grading of kitchen knife (Supplementary) ... 9 
Additional information ... 10 
Kitchen knives
1 Subject content and scope of application
This standard specifies the product classification, technical requirements, test
methods, inspection rules and markings, packaging, transportation, storage of
kitchen knives.
This standard applies to kitchen knives.
2 Normative references
GB 2828 Sampling procedures and tables for lot-by-lot inspection by
attributes (Apply to inspection of successive lots or batches)
GB 2829 Sampling procedures and tables for periodic inspection by
attributes (Apply to inspection of stability for productive process)
3 Classification of products
3.1 The product type is determined, according to the situation of the respective
enterprise or local characteristics, as well as special requirements.
3.2 The names of the main parts of the product are as shown in the Figure.
3.3 The specifications of the product are divided into 1* ~ 8*, category A and B,
according to the length of the blade (the longest part). The specifications and
dimensions are as shown in Table 1.
Knife edge Knife head Knife back Trademark
Knife
hoop
Knife
handle Knife tail Washer
Knife root
Blade length
is acicular tempered martensite + fine needle tempered martensite + granular
carbide + a small amount of residual austenite (bainite is allowed).
4.4 Partial steel is not allowed on the blade of composite steel kitchen knife.
The width of apparent steel is not less than 0.5 mm. There must be no defects,
such as over-burning, fracture, dust inclusion, etc.
4.5 Roughness
4.5.1 If the main body of the blade is carbon steel, its roughness is Rα3.2 µm.
4.5.2 If the main body of the blade is stainless steel, its roughness is Rα1.6 µm.
4.6 The blade is straight and symmetrical, except for special design
requirements.
4.7 The cumulative length of polished coarse wire and black wire, which is less
than 10 mm, on the knife body, shall not exceed 50 mm. The number of pits,
which is less than 1 mm2, shall not exceed 5.
4.8 Knife handle, knife hoop, washers
4.8.1 There is no looseness or deformation, after the end of the knife handle
bears a radial tension of 80 N. Knife hoop and washers shall be assembled
tightly, firm, straight.
4.8.2 There shall be no pores or sand holes in the welding place, between the
metal handle and the knife body; there is no water leakage; the welding shall
be flat and smooth.
4.8.3 There is no looseness or deformation of the plastic knife handle, after the
temperature resistance test.
4.9 The trademark shall be clear and upright.
4.10 See Appendix A (Supplementary) for the quality grading requirements of
kitchen knives.
5 Test method
5.1 Product specifications are tested by universal measuring tools.
5.2 Sharpness: Use a kitchen knife sharpness tester to test; measure one point
at each of the front and rear 1/3 of the blade.
5.3 Hardness test: Use a hardness tester, to measure one point, each at the
front, middle, back within 5 ~ 8 mm from the cutting edge line.
5.4 The metallographic organization is examined by a metallographic
microscope (500X). The observation position is on the middle cross section of
the blade length, 3 ~ 10 mm away from the cutting edge.
5.5 Quenching width and apparent steel and partial steel test: Coat 5% nitric
acid solution on the cutting edge of the knife head and root, respectively, to
observe the color; measure it visually and with a ruler.
5.6 Roughness test: Use a roughness tester OR compare with roughness
samples. Use instrument measurement as the arbitration method.
5.7 Thick wire, black wire, pitting is measured by template or ruler.
5.8 Knife handle's strength test: Use the knife hoop as the fulcrum and the back
as the bottom surface. Use the hanging weight method, at 10 mm on the tail
end of the knife handle.
5.9 Temperature resistance test of plastic knife handle: The plastic knife handle
is immersed in water at 100 °C for 15 minutes.
5.10 For other technical requirements, use visual inspection and hand feel
inspection.
6 Inspection rules
6.1 The product can leave the factory, only after it has passed the inspection by
the quality inspection department of the manufacturer, according to this
standard.
6.2 The products are divided into exit-factory inspection and type inspection.
6.2.1 Exit-factory inspection
It is performed according to the provisions of GB 2828. Use one sampling plan
of normal inspection. Carry out calculation based on the number of unqualified
products per 100 units. The inspection items, nonconformance classification,
inspection level, acceptance quality level shall meet the requirements of Table
4.
factory inspection. It is first re-inspected, according to the exit-factory inspection
items. After the re-inspection is qualified, carry out the type inspection.
6.3 If it fails in the inspection, it shall double the quantity for re-inspection. If it
still fails in the re-inspection, the batch of products shall be judged as
unqualified.
6.4 It is allowed for both parties to negotiate and adopt other inspection rules.
7 Marking, packaging, transportation, storage
7.1 Marking
There shall be a permanent trademark on the product.
7.2 Packaging
7.2.1 Each knife shall be packed in paper bag or plastic bag; it is accompanied
with product description, manufacturer name, qualification mark.
7.2.2 The packing box shall indicate:
a. Product name, specification, grade;
b. The name and address of the manufacturer;
c. Date of manufacture and date of exit-factory;
d. Quantity;
e. Gross weight or net weight, kg;
f. Volume: length x width x height, cm3;
g. Moisture-proof mark.
7.2.3 Export packaging will be determined separately.
7.3 Transportation
Throwing, rain, and moisture shall be strictly prohibited during transportation.
7.4 Storage
The product shall be stored in a ventilated, dry warehouse, which has a relative
humidity of no more than 80%. The product shall be more than 150 mm above
the ground. In the absence of acid, alkali or other corrosive gases, the product
will have a rust prevention period of 6 from the date of exit-factory.
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.