TB/T 1979-2014 English PDF (TBT1979-2014)

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TB/T 1979-2014: Atmospheric corrosion resisting steel for railway rolling stock
TB/T 1979-2014
TB
RAILWAY INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 45.060.20
S 05
Replacing TB/T 1979-2003
Atmospheric corrosion resisting steel for
railway rolling stock
ISSUED ON. SEPTEMBER 26, 2014
IMPLEMENTED ON. MARCH 1, 2015
Issued by. State Railway Administration
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Dimension, shape, weight and allowable deviation ... 5
4 Representation method of steel grades ... 5
5 Technical requirements ... 6
6 Inspection methods ... 10
7 Inspection rules ... 11
8 Packaging, marking and quality certificate ... 12
Annex A (informative) Comparison table of atmospheric corrosion resisting steel
grades in old- and new- version standards ... 13
Foreword
This Standard is drafted according to the rules given in GB/T 1.1-2009.
This Standard replaces TB/T 1979-2003 “Ordering technical conditions of atmospheric
corrosion resisting steel for railway rolling stock”; compared with TB/T 1979-2003, main
technical changes are as follows.
- ADD the representation method of atmospheric corrosion resisting steel grades
(see Clause 4);
- The naming of atmospheric corrosion resistant steel grades is changed from the
naming by the main chemical composition in steel TO the naming by the lower
yield limit of steel (see 5.1.1 of this Standard, 4.1.1 of 2003 version);
- ADD the high-strength atmospheric corrosion resisting steel (see Table 1);
- MERGE the cold-rolled 05CuPCrNi steel and cold-rolled 09CuPCrNi-A in the
original standard (see Table 1);
- ADD the requirements for the control sample Q345B of corrosion resistance test
(see Table 6);
- MODIFY the batch weight of atmospheric corrosion resisting steel (see 7.2 of this
Standard, 6.3 of 2003 version);
- ADD the requirements for the corrosion resistance test frequency (see 7.2);
- ADD the comparison table of atmospheric corrosion resisting steel grades in new-
and old-version standards (see Annex A).
This Standard is proposed by and under the jurisdiction of Institute of Standards and
Metrology of Ministry of Railways.
Drafting organizations of this Standard. Institute of Standards and Metrology of Ministry
of Railways, Institute of Metals and Chemistry of Institute of Intercalary Railway,
Baoshan Iron and Steel Co., Ltd.
Main drafters of this Standard. Zhu Mei, Gao Junli, Zhang Bin, Yang Songbai, Qu
Zhaoxia.
The previous version of the standards replaced by this Standard are as follows.
- TB/T 1979-1987, TB/T 1979-2003.
Atmospheric corrosion resisting steel for railway
rolling stock
1 Scope
This Standard specifies the dimension, shape, weight and allowable deviation,
representation method of steel grades, technical requirements, inspection methods,
inspection rules, packaging, marking and quality certificates of atmospheric corrosion
resisting steel for railway rolling stock.
This Standard applies hot-rolled and cold-rolled steel sheet, plate and strip and
structural steel of atmospheric corrosion resisting steel for railway rolling stock.
2 Normative references
The following documents are indispensable for the application of this document. For
dated references, only the dated edition applies to this document. For undated
references, the latest edition (including all amendments) applies to this document.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223 Methods for chemical analysis of iron, steel and alloy
GB/T 228.1 Metallic materials - Tensile testing - Part 1. Method of test at room
temperature
GB/T 229 Metallic materials - Charpy pendulum impact test method
GB/T 232 Metallic materials - Bend test
GB/T 247 General rule of package mark and certification for steel plates (sheets)
and strips
GB/T 706 Hot rolled section steel
GB/T 708 Dimension shape weight and tolerance for cold-rolled steel plates and
sheets
GB/T 709 Dimension, shape, weight and tolerances for hot-rolled steel plates and
sheets
GB/T 2101 General requirement of acceptance packaging marking and certification
for section steel
GB/T 2975 Steel and steel products - Location and preparation of test pieces for
mechanical testing
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents -
Spark discharge atomic emission spectrometric method (routine method)
GB/T 6394 Metal - Methods for estimating the average grain size
GB/T 10561 Steel - Determination of content of nonmetallic inclusions -
Micrographic method using standards diagrams
GB/T 17505 Steel and steel products - General technical delivery requirements
GB/T 20066 Steel and iron - Sampling and preparation of samples for the
determination of chemical composition
GB/T 20125 Low-alloy steel - Determination of multi-element contents - Inductively
coupled plasma atomic emission spectrometric method
TB/T 2375 Test method for cyclic wetting corrosion of weathering steels for railway
applications
3 Dimension, shape, weight and allowable deviation
3.1 The dimension, shape, weight and allowable deviation of steel plates, sheets and
strips shall comply with the relevant specifications of GB/T 709, GB/T 708.
3.2 The dimension, shape, weight and allowable deviation of hot-rolled steels shall
comply with the relevant specifications of GB/T 706; the dimension, shape, weight and
allowable deviation of cold-formed steels shall comply with the corresponding product
specifications.
4 Representation method of steel grades
The steel grade consists of the lower yield strength code, lower yield strength limit
value, atmospheric corrosion resisting steel code, delivery state code and steel
category, the specific structure is as follows.
0.55 3.50 0.65
Q400NQR1 ≤ 0.12 ≤ 0.75 ≤ 1.10 ≤ 0.025 ≤ 0.008 0.20 ~0.55 —
0.30 ~
1.25
0.12 ~
0.65 —
Q450NQR1 ≤ 0.12 ≤ 0.75 ≤ 1.50 ≤ 0.025 ≤ 0.008 0.20 ~0.55 —
0.30 ~
1.25
0.12 ~
0.65 —
Q450EWR1 ≤ 0.07 ≤ 0.50 ≤ 1.50 ≤ 0.020 ≤ 0.010 0.30 ~0.55 —
3.00 ~
5.50
0.10 ~
0.65 —
Q500NQR1 ≤ 0.12 ≤ 0.75 ≤ 2.00 ≤ 0.025 ≤ 0.008 0.20 ~0.55 —
0.30 ~
1.25
0.12 ~
0.65 —
Q550NQR1 ≤ 0.16 ≤ 0.75 ≤ 2.00 ≤ 0.025 ≤ 0.008 0.20 ~0.55 —
0.30 ~
1.25
0.12 ~
0.65 —
Q265NQL2 ≤ 0.12 0.10 ~ 0.40
0.20 ~
0.50
0.060 ~
0.12 ≤ 0.020
0.25 ~
0.45 —
0.30 ~
0.65
0.25 ~
0.50 —
Q310NQL2 ≤ 0.12 0.25 ~ 0.75
0.20 ~
0.50
0.060 ~
0.12 ≤ 0.020
0.25 ~
0.50 —
0.30 ~
1.25
0.12 ~
0.65 —
Q310NQL3 ≤ 0.12 0.20 ~ 0.40
0.25 ~
0.55
0.060 ~
0.12 ≤ 0.020
0.25 ~
0.50
Ti ≤
0.030 — —
0.010 ~
0.040
NOTE. See Annex A for the comparison of atmospheric corrosion resisting steel grades in new-
and old-version standards.
a RE value is the rare-earth content in the finished steel. when S ≤ 0.01%, it can guarantee a
certain amount of rare earth residues.
5.1.2 In order to improve the properties of steels, for Category 1 and Category 2 steels,
it may add trace alloying elements such as V, Nb, Ti, however, the sum of these alloys
shall not exceed 0.22%.
5.1.3 The allowable upper deviation between the chemical composition of rare-earth
elements in the finished steel and the specified value in Table 1 is 0, and the allowable
lower deviation is -0.0040%. The allowable deviation between other chemical
compositions in the finished steel and the specified in Table 1 shall comp...