Q/BQB 409-2014 (Q/BQB 409-2023 Newer Version) PDF English
Q/BQB 409-2014 (Q/BQB409-2014, QBQB 409-2014, QBQB409-2014)
Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Name of Chinese Standard | Status |
Q/BQB 409-2023 | English | 319 |
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Cold-rolled steel sheet and strip for hot-stamping use
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Q/BQB 409-2020 | English | 165 |
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Cold-rolled steel sheet and strip for hot-stamping use
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Q/BQB 409-2018 | English | 90 |
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Hot stamping cold-rolled steel sheet and strip
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Q/BQB 409-2014 | English | 330 |
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0-9 seconds. Auto-delivery.
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Hot stamping steel sheet and strip
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Newer version: Q/BQB 409-2023 Standards related to (historical): Q/BQB 409-2023
Q/BQB 409-2014: PDF in English (QBQB 409-2014) Q/BQB 409-2014
Supply Technical Conditions of Baoshan Iron and Steel Co., Ltd.
Steel plates and steel strips for hot stamping
1 Scope
This Technical Conditions specifies the requirements for the classification and
code, dimension, shape, technical requirements, inspection and test of steel
plates and steel strips for hot stamping.
This Technical Conditions applies to steel plates and steel strips for hot
stamping (hereinafter referred to as steel plates and steel strips) with a
thickness of 0.7 mm to 5.0 mm produced by Baoshan Iron and Steel Co., Ltd.
Steel plates and steel strips with a thickness of less than 2.0 mm are usually
delivered by cold-rolled surface. Steel plates and steel strips with a thickness
of not less than 2.0 mm are usually delivered by hot-rolled rolled surface and
hot-rolled pickled surface.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 222-2006 Permissible tolerances for chemical composition of steel
products
GB/T 223 Methods for chemical analysis of iron, steel and alloy
GB/T 228.1-2010 Metallic materials - Tensile testing - Part 1. Method of test
at room temperature
GB/T 230.1-2009 Metallic materials - Rockwell hardness test - Part 1. Test
method (scales A, B, C, D, E, F, G, H, K, N, T)
Bright surface B
5 Information required for ordering
5.1 The user shall provide the following information when ordering.
a) product name (steel plate or steel strip);
b) number of this Technical Conditions;
c) grade;
d) surface state (when delivered in hot rolled state);
e) product specification and dimension, flatness accuracy;
f) edge state;
g) surface quality level;
h) packaging method;
i) use;
j) other.
5.2 For products delivered by cold-rolled surface, if the dimensional accuracy,
flatness accuracy, surface quality level, edge state and packaging method are
not indicated in the order contract, then the products in this Technical
Conditions are supplied as trimmed steel strips or trimmed steel plates with
ordinary dimension and flatness accuracy specified in Q/BQB 401, FB level
surface quality specified in Table 8, and packaged according to the packaging
method provided by the supply party. When the inner diameter of the steel coil
is not specified, the inner diameter of the steel coil is 610 mm.
5.3 For products delivered by hot-rolled pickled surface, if the dimensional
accuracy, surface quality level, edge state and packaging method are not
indicated in the order contract, then the products in this Technical Conditions
are supplied as trimmed steel strips or trimmed steel plates with relatively
advanced thickness accuracy specified in Q/BQB 301, FB level surface quality
specified in Table 9, and packaged according to the packaging method provided
by the supply party. When the inner diameter of the steel coil is not specified,
the inner diameter of the steel coil is 610 mm.
5.4 For products delivered by hot-rolled rolled surface, if the dimensional
accuracy, surface quality level, edge state and packaging method are not
7.3.3 For steel plates and steel strips delivered by cold-rolled surface, oiling
shall normally be applied and the oil film applied shall be able to be removed
with aqueous alkaline solution. Under normal conditions of packaging,
transportation, handling and storage, the supply party shall ensure that the
surface of steel plates and steel strips does not rust within 6 months from the
date of completion of the manufacture.
7.3.4 For steel plates and steel strips delivered by pickled surface, oiling shall
normally be applied and the oil film applied shall be able to be removed with
aqueous alkaline solution. Under normal conditions of packaging,
transportation, handling and storage, the supply party shall ensure that the
surface of steel plates and steel strips does not rust within 3 months from the
date of completion of the manufacture.
7.3.5 According to the requirements of the demand party, agreed upon between
the supply and demand parties and specified in the contract, products may also
be supplied without oiling. For non-oiled products, the supply party will not bear
the corresponding product quality responsibility for defects such as rust,
scratches and friction marks during the handling, storage and use.
NOTE. The date of issue in the product inspection document is usually specified as the date of
completion of the manufacture of the product.
7.4 Mechanical properties
7.4.1 The supply party shall ensure that the mechanical properties of steel
plates and steel strip before hot stamping comply with the requirements of Table
6 within 6 months from the date of completion of the manufacture.
7.4.2 After steel plates and steel strips are hot stamped into relevant parts, their
performance shall comply with the requirements of Table 7. The supply party
does not provide a performance inspection report for the relevant parts.
7.4.3 When steel plates and steel strips are supplied according to the specified
parts, the supply and demand parties may agree on a range of mechanical
properties that meet the processing needs of the part as the acceptance criteria.
At this time, the mechanical properties specified in Tables 6 and 7 will no longer
be used as the basis for delivery and acceptance.
7.4.4 Due to the influence of aging, the mechanical properties of steel plates
and steel strips will deteriorate with the prolongation of storage time, such as
the increase of yield strength and tensile strength, the decrease of elongation
after break, formability deteriorates, tensile strain marks appear, etc. It is
recommended that users use it as soon as possible.
with suitable measuring tools.
8.3 The tensile test shall be in accordance with Method B of GB/T 228.1. In
order to improve the reproducibility of the measurement results, it is
recommended to use the beam displacement control method. The rate to
measure the yield strength is 5 % Lc/min (Lc is the parallel length of the
specimen).
8.4 Steel plates and steel strips shall be accepted in batches. When delivered
by cold-rolled surface, each inspection batch shall consist of steel plates and
steel strips of the same grade, the same specification and the same processing
state of not more than 30 tons. For steel strips weighing more than 30 tons,
each steel coil constitutes an inspection batch. When delivered by hot-rolled
rolled and hot-rolled pickled surfaces, each inspection batch shall consist of
steel plates and steel strips of the same furnace number, the same grade, the
same thickness, and the same delivery state of not more than 70 tons.
8.5 The inspection items, specimen quantity, sampling method and test method
of each batch of steel plates and steel strips shall comply with the requirements
of Table 11.
8.6 The supply party may use different inspection and test methods for
acceptance testing. In the event of a dispute, the test shall be carried out using
the inspection and test methods specified in this Technical Conditions and the
relevant technical requirements.
Table 11
Inspection item Specimen quantity (piece)
Sampling
method Test method
Chemical
analysis 1/furnace GB/T 20066
GB/T 223, GB/T 4336, GB/T 20123,
GB/T 20125, GB/T 20126
Tensile test 1/batch
GB/T 2975
GB/T 228.1 Method B
Hardness 1/batch GB/T 230.1, GB/T 4340.1
Surface
roughness - GB/T 2523
8.7 Re-inspection
For the tensile test, if the test result of one item does not meet the technical
requirements, then take double the quantity of specimens from the same batch
for the re-inspection of the unqualified item. If the re-inspection result (including
all the indicators required for the test of this item) is qualified, the whole batch
is qualified. For the re-inspection result (including all the indicators required for
the test of this item), even if one of the indicators is unqualified, the re-
inspection is unqualified. If the re-inspection is unqualified, the single piece of
...... Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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