YB/T 4159-2007 English PDF (YBT4159-2007)

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YB/T 4159-2007: Hot rolling checker plate and strip
YB/T 4159-2007
YB
FERROUS METALLURGY INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
Hot rolling checker plate and strip
ISSUED ON. JANUARY 25, 2007
IMPLEMENTED ON. JULY 01, 2007
Issued by. National Development and Reform Commission of PRC
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Classification and code ... 5 
4 Ordering information ... 5 
5 Size, shape, weight and tolerance ... 6 
6 Technical requirements ... 9 
7 Test methods ... 10 
8 Inspection rules ... 11 
9 Packaging, marking, quality certificate ... 11 
Appendix A (Informative) Theoretical weighting method for hot rolled steel
checker plate... 12 
Hot rolling checker plate and strip
1 Scope
This standard specifies the classification and code, the information required for
ordering, size, shape, weight and tolerance, technical requirements, test
methods, inspection rules, packaging, marking, quality certificate of hot-rolled
steel checker plate and strip.
This standard applies to diamond-shaped, lentil-shaped, round-bean-shaped
and combined-shaped hot-rolled steel checker plate and strip (hereinafter
referred to as steel plates and steel strips).
2 Normative references
The provisions in following documents become the provisions of this standard
through reference in this standard. For the dated references, the subsequent
amendments (excluding corrections) 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 222 Permissible tolerances for chemical composition of steel products
GB/T 223 Steel, iron and alloy - Chemical analysis method
GB/T 228 Metallic materials – Tensile testing at ambient temperature (GB/T
228-2002, eqv ISO 6892.1998)
GB/T 232 Metallic materials - Bend test (GB/T 232-1999, eqv ISO 7438.1985)
GB/T 247 General rule of package mark and certification for steel plates
(sheets) and strips
GB/T 700 Carbon structural steels
GB/T 709 Dimensions, shape, weight and tolerances for hot rolled steel
sheets and strips
GB 712 Ship and ocean engineering structural steel
GB/T 2975 Steel and steel products - Location and preparation of test pieces
for mechanical testing
GB/T 4171 Superior atmospheric corrosion resisting structural steel
GB/T 4336 Standard test method for spark discharge atomic emission
spectrometric analysis of carbon and low-alloy steel (Routine method)
GB/T 20066 Steel and iron - Sampling and preparation of samples for the
determination of chemical composition
YB/T 081 Rule for rounding off of numerical values and judgement of testing
values for technical standards of metallurgy
3 Classification and code
3.1 Classified by edge status.
Edge-cut. EC
Non-edge-cut. EM
3.2 Classified by pattern shape.
Rhombus-shaped. LX
Lentil-shaped. BD
Round-bean-shaped. YD
Combined-shaped. ZH
4 Ordering information
When ordering, the user shall provide the following information.
a) This standard number;
b) Designation;
c) Product category (steel plate or steel strip);
d) Specifications;
e) Pattern shape;
f) Edge status;
g) Use;
h) Other requirements.
tensile and bending tests. The performance indicators shall comply with the
provisions of GB/T 700, GB 712, GB/T 4171 or as agreed by both parties.
6.4 Surface quality
6.4.1 The surface of the steel plates and steel strips shall be free from air
bubbles, crusting, cracking, folding or inclusions. Steel plates and strips must
not be delaminated.
6.4.2 The surface of steel plates and strips is allowed to have a thin-layer of
iron oxide scale, rust, surface roughness formed by the shedding of iron oxide
scales or other local defects whose height or depth does not exceed the
tolerance. The pattern shall be complete, it allows a slight burr which has a
height not exceeding half the thickness tolerance on the pattern.
6.4.3 During the continuous production of steel strips, since the local surface
defects are not easily found and removed, it allows to deliver the steel strips
with defects. But the defective parts must not exceed 8% of the total length of
each roll of steel strip.
7 Test methods
7.1 The appearance of steel plates and strips are visually-checked. The size
and shape are measured by a suitable tool.
7.2 The basic thickness and pattern height of the steel plate and steel strip are
measured along the width direction at a distance of not less than 40 mm from
the edge. For the steel strips supplied in rolls, the total length at both ends
where the appearance and size are not evaluated is as follows.
But the maximum value is not more than 20 m.
7.3 The inspection items, sampling quantities, sampling methods and test
methods for each batch of steel shall comply with the requirements of Table 4.
Table 4
No. Inspection items Sampling quantity Sampling method Test method
1 Chemical analysis 1 per furnace GB/T 20066 GB/T 223, GB/T 4336
2 Tensile a, b 1 GB/T 2975 GB/T 228
3 Cold-bending a, c 1 GB/T 2975 GB/T 232
a It is inspected where the user has requirement.
b For the mechanical property specimen, it shall keep the original pattern surface, the strength is
calculated based on basic thickness.
Basic thickness (mm)