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GB 13014-2013: [GB/T 13014-2013] Quenching and self-tempering ribbed bars for the reinforcement of concrete
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Basic data | Standard ID | GB 13014-2013 (GB13014-2013) | | Description (Translated English) | [GB/T 13014-2013] Quenching and self-tempering ribbed bars for the reinforcement of concrete | | Sector / Industry | National Standard | | Classification of Chinese Standard | H44 | | Classification of International Standard | 77.140.60 | | Word Count Estimation | 15,197 | | Older Standard (superseded by this standard) | GB 13014-1991 | | Quoted Standard | GB/T 222; GB/T 223.5; GB/T 223.11; GB/T 223.12; GB/T 223.14; GB/T 223.17; GB/T 223.19; GB/T 223.23; GB/T 223.26; GB/T 223.37; GB/T 223.40; GB/T 223.59; GB/T 223.63; GB/T 223.68; GB/T 223.69; GB/T 228.1; GB/T 232; GB 1499.2-2007; GB/T 2101; GB/T 4336; GB/T | | Regulation (derived from) | National Standards Bulletin No. 18 of 2013 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the use of waste heat treated steel reinforced concrete code, size, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate. This standard applies to the reinforcement of co | GB 13014-2013: [GB/T 13014-2013] Quenching and self-tempering ribbed bars for the reinforcement of concrete
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Quenching and self-tempering ribbed bars for the reinforcement of concrete
ICS 77.140.60
H44
National Standards of People's Republic of China
Replacing GB 13014-1991
Reinforced concrete reinforced with heat treatment
Issued on. 2013-09-18
2014-07-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Table of Contents
Preface Ⅰ
1 Scope 1
2 Normative references 1
3 Terms and definitions 2
4 classification, Grade 2
5 order contents 2
6 size, shape, weight and tolerances 2
7 Technical requirements 6
8 test items and test methods 8
9 inspection rules 9
10 packaging, marking and certification 10
Appendix A (informative) characteristics of heat treated steel 11
Foreword
This standard 6.4.1,7.3.5,7.4.2,7.5 Table 3 dimensions a, b, Appendix A are recommended, the rest are mandatory.
This standard was drafted in accordance with GB/T 1.1-2009 given rules.
This standard section instead of GB 13014-1991 "reinforced concrete with heat treated steel."
This standard compared with GB 13014-1991, in addition to editorial changes outside the main technical changes are as follows.
--- Modification and increased heat treated steel grades, change the KL400 to RRB400 steel, an increase of RRB500 grades; steel
Tendons purpose into weldable and non-weldable;
--- Modify the definition of steel heat treatment;
--- Chapter 5 orders increased content;
--- Increasing the size 50mm steel;
--- 7.4.2 adds reverse bending properties, fatigue properties 7.5, 7.6 connectivity three technical requirements;
--- Modify the nominal diameter 8mm ~ 12mm rebar weight deviation;
--- Modify the "surface shape and size tolerances ribbed steel", "surface quality", "Batch Rules," "packaging, marking and quality
Certificate "and other similar terms;
--- 8.3.5 adds artificial aging process conditions;
--- According to the requirement for increased RRB400, RRB500 chemical composition, mechanical properties and process performance requirements;
--- Added Appendix A "feature heat treatment of steel."
The standard proposed by China Iron and Steel Association.
This standard by the National Steel Standardization Technical Committee (SAC/TC183) centralized.
This standard was drafted. Metallurgical Research Institute, Metallurgical Information Standards Institute Group in the construction industry, Jiangsu Shagang Group Co., Ltd., saddle
Mountain Iron and Steel Co., Ltd., Fujian Sanming Iron and Steel (Group) Co., Ltd., built by mechanical (Tianjin) Co., Ltd., Tianjin days Rail rolling
Two Steel Limited.
The main drafters of this standard. Zhu Jianguo, Chao Feng, Chen Jie, Huang Zhengyu Liu gem, Fang Extension field, Hou Jie, Zhang Hu Ming really, Shi Guoming,
Li Xiaobo, after Weiguo, Liu Jianfeng, Yu Zhi Liang, Guoji Fei, Liu Tao.
This standard replaces the standards previously issued as follows.
--- GB 13014-1991.
Reinforced concrete reinforced with heat treatment
1 Scope
This standard specifies the concrete reinforced with heat processing code, size, shape, weight, technical requirements, test methods, inspection regulations
Then, packaging, marking and quality certificate.
This standard applies to the reinforcement of concrete surface hardening and self-tempering of steel.
This standard does not apply to finished steel and scrap steel rolled again reinforced.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated edition applies to this
file. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 222 chemical composition of finished steel tolerance
GB/T 223.5 steel measuring soluble silicon and total silicon content reduced silicon molybdate salt spectrophotometric method
Determination of GB/T 223.11 steel and alloy chromium content of visual titration or potentiometric titration
GB/T 223.12 Methods for chemical analysis of iron, steel and alloys of sodium carbonate separation - diphenyl hydrazine spectrophotometric determination of chromium content
GB/T 223.14 Methods for chemical analysis of iron, steel and alloys, tantalum reagent extraction and spectrophotometric determination of vanadium content
GB/T 223.17 steel and alloy chemical analysis method two titanium content determination in methane antipyrine
GB/T 223.19 Methods for chemical analysis of iron, steel and alloy neocuproine - chloroform extraction spectrophotometric determination of copper content
GB/T 223.23 steel and alloy - Determination of nickel content dimethylglyoxime spectrophotometry
GB/T 223.26 steel and alloy - Determination of molybdenum content - Thiocyanate spectrophotometric
GB/T 223.37 Methods for chemical analysis of iron, steel and alloy distillation - indophenol blue photometric method for the determination of nitrogen
GB/T 223.40 Determination of steel and alloy niobium content sulphochlorophenol S spectrophotometry
GB/T 223.59 Steel and Alloy Determination of phosphorus content by bismuth phosphomolybdate blue spectrophotometric method and antimony phosphomolybdate blue spectrophotometry
GB/T 223.63 Methods for chemical analysis of iron, steel and alloy The sodium (potassium) for Determination of amount
Determination of sulfur content of potassium iodate titration method after GB/T 223.68 Methods for chemical analysis of iron, steel and alloy tube furnace combustion
GB/T 223.69 after carbon and alloy steel - Determination of the pipe furnace combustion gas volumetric method
RT Test Method. Test Part 1 GB/T 228.1 metallic materials tensile
GB/T 232 metallic materials - Bend test
GB 1499.2-2007 Steel for reinforced concrete - Part 2. Hot rolled ribbed bars
General provisions GB/T 2101 steel acceptance, packaging, marking and quality certificate
GB/T 4336 carbon steel and low alloy steel spark source atomic emission spectrometry method (conventional method)
GB/T 4340.1 metallic materials - Vickers hardness test - Part 1. Test methods
GB/T 17505 Steel and steel products General technical delivery requirements
GB/T 20066 Steel and iron - Sampling and determination of the chemical composition of the sample with a sample preparation method
Steel Test methods GB/T 28900 for reinforced concrete
Determining rounding and detection values YB/T 081 standard metallurgical technical value
YB/T 5126 reinforced concrete steel bending and reverse bending test method
3 Terms and Definitions
GB 1499.2 define the following terms and definitions apply to this document.
3.1
Reinforced concrete with heat treated steel quenchingandself-temperingribbedsteelbarsforthereinforcement
ofconcrete
By heat treatment after hot surface controlled cooling principle, and use their own core heat tempering complete the resulting finished steel.
Quenching a ring on its base circle of self-tempering organization.
4 classification, designation
4.1 Reinforced concrete reinforced with heat treated according to the yield strength characteristic values into 400, 500, use is divided into weldable and non-weldable.
4.2 Composition and meaning reinforced grades are shown in Table 1.
NOTE. 4.1 weldable refers to the procedure specified in the welding flash butt welding and arc welding and other processes.
Table 1
Category Grade Grade English letters constituting meaning
Heat treated steel
RRB400
RRB500
Yield strength specified by the RRB
Eigenvalues constitute
RRB400W
Yield strength specified by the RRB
Eigenvalues constitute weldable
RRB --- heat treated tendons abbreviation,
W --- welding abbreviation
5 order contents
Contract in accordance with this standard orders shall include at least the following.
a) number of this standard;
b) the product name;
c) steel grades;
d) reinforced nominal diameter, length (or disc diameter) and weight (or quantity, or disc weight);
e) special requirements.
6 size, shape, weight and tolerance
6.1 nominal diameter range and recommended diameter
Reinforced nominal diameter in the range of 8mm ~ 50mm, RRB400, RRB500 recommended reinforced nominal diameter of 8mm, 10mm,
12mm, 16mm, 20mm, 25mm, 32mm, 40mm, 50mm, RRB400W reinforced preferred diameter of 8mm, 10mm,
12mm, 16mm, 20mm, 25mm, 32mm, 40mm.
6.2 Nominal cross-sectional area of the theoretical weight
Reinforced nominal cross-sectional area and the theoretical weight set forth in Table 2.
Table 2
Nominal diameter/mm nominal cross-sectional area/mm2 theoretical weight/(kg/m)
twenty two
50.27
78.54
113.1
153.9
201.1
254.5
314.2
380.1
490.9
615.8
804.2
0.395
0.617
0.888
1.21
1.58
2.00
2.47
2.98
3.85
4.83
6.31
7.99
9.87
15.42
NOTE. theoretical weight calculated density of 7.85g/cm3.
Surface shape and dimensions 6.3 ribbed steel tolerance
6.3.1 ribbed steel horizontal rib design principles should meet the following requirements.
a) the angle β axis transverse ribs and steel of not less than 45 °, when the angle is not more than 70 °, reinforced transverse ribs on opposite sides of a direction should
in contrast.
b) transverse ribs nominal spacing not greater than 0.7 times the nominal rebar diameter.
c) the cross ribs and reinforced side surface angle α of not less than 45 °.
d) steel cross ribs on opposite sides of the gap between the ends (including longitudinal ribs width) shall not exceed the sum of the nominal 20% reinforced perimeter.
e) When the bar nominal diameter of not more than 12mm, the relative rib area of not less than 0.055; nominal diameter of 14mm and 16mm
, The relative rib area of not less than 0.060; nominal diameter greater than 16mm, the relative rib area of not less than 0.065. relatively
Calculation rib area refer to GB 1499.2-2007 Appendix C.
6.3.2 ribbed steel usually with longitudinal ribs, or without longitudinal ribs.
6.3.3 with longitudinal ribs crescent ribbed steel bars, its shape shown in Figure 1, the dimensions and tolerances shall comply with the provisions in Table 3. Weight deviation breaks
Together Table 4, the inner diameter deviation not reinforced delivery conditions.
6.3.4 without longitudinal ribs crescent ribbed steel bars, its diameter size can be specified in Table 3 to make appropriate adjustments, but the weight tolerance should still be in accordance with Table
4 stipulations.
Explanation.
d1 --- reinforced inner diameter;
α --- oblique transverse ribs;
h --- transverse rib height;
β --- cross ribs and the axis angle;
h1 --- longitudinal rib height;
θ --- oblique longitudinal ribs;
a --- longitudinal rib top width;
l --- lateral rib spacing;
b --- horizontal rib top width.
Figure 1 crescent steel (with longitudinal ribs) and cross-sectional shape of the surface
Table 3 millimeters
Nominal
diameter
The inner diameter d1 transverse rib height h
Nominal size Nominal size Tolerance Tolerance
Longitudinal rib height h1
(no greater than)
Transverse ribs
Top width b
Longitudinal ribs
A top width
Spacing l
Nominal size Tolerance
The end of the maximum transverse ribs
Gap (nominal perimeter
10% of the chord)
8 7.7
10 9.6
11.5 12
13.4 14
15.4 16
18 17.3
19.3 20
22 21.3
24.2 25
28 27.2
31.0 32
35.0 36
38.7 40
48.5 50
± 0.4
± 0.5
± 0.6
± 0.7
± 0.8
0.8
1.0
1.2
1.4
1.5
1.6
1.7
1.9
2.1
2.2
2.4
2.6
2.9
3.2
0.4
-0.3
± 0.4
0.4
-0.5
± 0.5
± 0.6
0.8
-0.7
1.0
-0.8
± 1.1
± 1.2
1.1 0.5 1.5 5.5
1.3 0.6 1.5 7.0
1.6 0.7 1.5 8.0
1.8 0.8 1.8 9.0
1.9 0.9 1.8 10.0
2.0 1.0 2.0 10.0
2.1 1.2 2.0 10.0
2.4 1.3 2.5 10.5
2.6 1.5 2.5 12.5
2.7 1.7 3.0 12.5
3.0 1.9 3.0 14.0
3.2 2.1 3.5 15.0
3.5 2.2 3.5 15.0
3.8 2.5 4.0 16.0
± 0.5
± 0.8
± 1.0
2.5
3.1
3.7
4.3
5.0
5.6
6.2
6.8
7.7
8.6
9.9
11.1
12.4
15.5
Note 1. longitudinal rib angle θ of 0 ° ~ 30 °.
Note 2. Dimensions a, b of the reference data.
6.4 Length and tolerance
6.4.1 Length
6.4.1.1 steel is usually delivered by length, specific length of delivery should be specified in the contract.
6.4.1.2 Reinforced can coil delivery, each dish should be a reinforced, allowing each batch of 5% Number of Discs (can have two time less than two) consists of two
Strip steel components. Its plate weight and diameter is determined by the supply and demand sides negotiated.
6.4.2 Length tolerance
Reinforced by the length of time of delivery allows deviation 0 ~ 50mm.
6.5 bending and ends
Straight bars bending degree should not affect normal use, the total curvature of not more than 0.4% total length of steel.
Reinforced cut ends should be honest, should not affect the use of local deformation.
6.6 weight and tolerances
6.6.1 reinforcement according to the actual weight or theoretical weight delivery.
6.6.2 Reinforced actual weight and theoretical weight tolerances shall comply with the requirements of Table 4.
Table 4
Nominal diameter/mm theoretical weight and the actual weight deviation /%
8 ~ 12 ± 6
14 ~ 20 ± 5
22 ~ 50 ± 4
7 Technical Requirements
7.1 Grades and chemical composition
7.1.1 Steel grades, chemical composition and carbon equivalents (melting analysis) should meet the requirements of Table 5. If necessary, the steel may be added V, Nb,
Ti and other elements.
table 5
Trademark
Chemical composition (mass fraction) /% (not more than)
C Si Mn PS Ceq
RRB400
RRB500
0.30 1.00 1.60 0.045 0.045 -
RRB400W 0.25 0.80 1.60 0.045 0.045 0.50
7.1.2 carbon equivalent CEV (percentage) value according to equation (1).
CEV = C Mn/6 (Cr V Mo)/5 (Cu Ni)/15 (1)
7.1.3 residual content of chromium steel, nickel, copper should each not more than 0.30%, a total amount of not more than 0.60%. By the need to agree, copper-containing residue
The amount may not be greater than 0.35%.
7.1.4 steel nitrogen content should not exceed 0.012%. As the supplier can guarantee may be analyzed. If a sufficient number of steel nitrogen binding elements,
Nitrogen content restrictions may be relaxed.
Finished chemical composition 7.1.5 reinforcement tolerances shall comply with the provisions of GB/T 222's. Carbon equivalent CEV to allow deviation
0.02%.
7.2 Delivery Status
Reinforced with heat treatment delivery.
7.3 Mechanical Properties
7.3.1 mechanical testing conditions for the delivery status or artificial aging state. In case of dispute, the test conditions were by artificial aging.
Mechanical performance characteristics 7.3.2 reinforcement value should be in accordance with Table 6.
Table 6
Trademark
ReL/MPa Rm/MPa A /% Agt /%
not less than
RRB400 400 540 14
RRB500 500 630 13
5.0
RRB400W 430 570 16 7.5
NOTE. After the aging test results.
7.3.3 diameter 28mm ~ 40mm various grades of steel Elongation A can be reduced by 1%. Diameter greater than 40mm of various grades of steel
The percentage elongation rate can be reduced by 2%.
7.3.4 For no apparent yield strength steel, the yield strength characteristic values ReL should be non-proportional extension strength Rp0.2.
7.3.5 According to the agreement between the elongation of the type can be selected from the A or Agt. Such as the type of elongation without the agreement determination, the elongation
Using A. Using Agt arbitration test.
7.4 Process Performance
7.4.1 bending performance
Table 7 provides the core diameter bend after bend 180 °, reinforced by the curved parts of the surface can not crack.
Table 7 millimeters
Grade nominal diameter core diameter d bend
RRB400
RRB400W
8 ~ 25 4d
28 ~ 40 5d
RRB500 8 ~ 25 6d
7.4.2 reverse bending performance
7.4.2.1 According to the requirements, it can be reinforced reverse bending performance test.
7.4.2.2 Reverse bending test bending test bending core diameter than the corresponding increase in a bar diameter.
7.4.2.3 Reverse bending test. first forward and then backward bend 90 ° bend 20 °. After the reverse bending test, reinforced by the curved parts of the surface
Can not crack.
7.5 Fatigue Performance
To request, by agreement between, the fatigue performance test. Technical requirements and test methods for fatigue testing by both parties
OK consultations.
7.6 connectivity
Quality inspection and acceptance of welded steel and mechanical connections shall comply with the relevant standards.
7.7 surface quality
7.7.1 The reinforcement should be no harmful surface defects.
7.7.2 The weight of the sample is too long by wire brush, size, tensile properties and cross-sectional area not less than the requirements of this standard, descaling, surface
Iron or uneven skin is not cause for rejection.
7.7.3 When the sample surface defects with a defect 7.7.2 does not comply with the provisions other than the bending tensile properties or performance requirements, it is considered
These defects are harmful.
7.8 features
Heat treated steel with the characteristics given in Appendix A.
8 test items and test methods
8.1 Test Project
Each batch of steel test items, sampling methods and test methods shall comply with the requirements in Table 8.
8.2 connectivity testing, metallurgical testing only type test, that is when steel production technology, there are significant changes and new products
get on.
8.3 stretching, bending and reverse bending test
8.3.1 stretching, bending, reverse bending test specimens does not allow turning.
8.3.2 calculation strength of steel with the cross-sectional area of the use of public listed in Table 2, said cross-sectional area.
Test total elongation Agt 8.3.3 maximum force, in addition to the requirements in Table 8 using GB/T 228.1 Test Method about outside, may also be used
GB/T 28900.
8.3.4 reverse bending test, the sample after bending forward, should be at a temperature less than 100 ℃ insulation 30min, after natural cooling
Then reverse bending. When the supplier can guarantee reinforced by reverse bending properties after artificial aging, the sample also positive after bending at room temperature BARS
Then reverse bending.
8.3.5 artificial aging conditions. The sample is heated to 100 ℃, heat 60min ~ 75min at 100 ℃ ± 10 ℃, and then in the rest
Air cooled to room temperature.
Table 8
Test item number number of samples Sampling Methods Test Method
chemical composition
(Melting analysis)
1 GB/T 20066
GB/T 223
GB/T 4336
2 2 optionally stretching two steel cut GB/T 228.1, this standard 8.3
3 2 optionally two curved steel cut GB/T 232, this standard 8.3
4 1 optionally a reverse bend YB/T 5126, this standard 8.3
5 consultation fatigue test
6 connectivity consultations
7 microstructure consultation
Size 8 by branch - this standard 8.4
9 surface by branch - visually
The standard deviation of 10% by weight 8.5 8.5 Standard
Note. When chemical analysis and tensile test results of dispute, arbitration test respectively GB/T 223, GB/T 228.1 conduct.
8.4 Measure
8.4.1 ribbed bars with diameter measuring accuracy of 0.1mm.
8.4.2 ribbed steel longitudinal ribs, transverse ribs measured by measuring the height of the longitudinal ribs on both sides of the same section, the average height of the center of the cross rib method Measure
Take maximum outer rebar, minus HERE diameter, resulting half the value of the premises rib height should be accurate to 0.1mm.
8.4.3 ribbed steel horizontal rib spacing by measuring the average rib distance method of measurement. Measure reinforced side take the first one and the second 11 transverse
Rib distance from the center, this value is divided by 10 is a cross-rib spacing should be accurate to 0.1mm.
Measuring 8.5 by weight bias
8.5.1 steel measuring weight deviation, the sample should be reinforced on a different root interception, number of samples is less than 5, each sample length is not less than
500mm. Length shall be measured by branch, it should be accurate to 1mm. When measuring the total weight of the sample should be accurate to less than 1% of the total weight.
8.5.2 actual weight and deviation from the theoretical weight rebar according to equation (2).
Weight deviation =
The actual total weight of the sample - (total length of the sample × theoretical weight)
The total length of the sample theoretical weight × ×
100% (2)
8.6 test results and numerical rounding determination shall comply with YB/T 081's.
9 inspection rules
Reinforcement of inspection is divided into eigenvalues for inspection and delivery inspection.
9.1 characteristic value test
9.1.1 eigenvalue test applies to the following conditions.
a) supply-side inspection of product quality control;
b) demand-side request, by agreement between the same test;
c) third-party product certification and arbitration inspection.
9.1.2 eigenvalue test shall GB 1499.2-2007 Appendix B regulations.
9.2 Delivery Inspection
9.2.1 Scope
Delivery acceptance test is suitable for testing batches of steel.
9.2.2 Batch rules
9.2.2.1 reinforcement should be granted inspection and acceptance, each batch by the same grade, the same furnace number, same size, same heat treatment system
Steel components. Batch weight of not more than 60t. Part of more than 60t, 40t each additional (or less than the remainder of 40t), adding a tensile test
Test specimens and a bend test specimens.
9.2.2.2 Allow the same grade, the same smelting methods, different furnace number one method of composition pouring mixed batch, but the carbon content of each furnace number
The difference is not more than 0.02%, the difference between the amount of manganese is not more than 0.15%. Mixed batch weight is not more than 60t.
9.2.3 Test items and the number of samples
Steel test items and the number of samples shall comply with the provisions of 9.2.2.1 and Table 8.
9.2.4 Test Results
Test results for each test item should be consistent with the relevant provisions of Chapter 6 and Chapter 7.
9.2.5 reinspection and determination
Reinforced retest determination shall comply with GB/T 17505 of.
10 packaging, marking and quality certification
10.1 with a surface marker ribbed bars shall meet the following requirements.
a) ribbed steel bars should be on the surface rolling grade signs, but also on the registered successively rolled Make (or trademark) and nominal diameter mm
digital.
b) steel grades in Arabic numerals with English letters, RRB400 to K4 represent; RRB500 to K5 represent;
RRB400W expressed in KW4. Make expressed in Pinyin prefix. Mm nominal diameter number in Arabic numerals.
c) nominal diameter of not more than 10mm of steel, rolling symbol may not, be used to hang signs methods.
d) signs should be clear, the size of the flag by the supplier according to the bar diameter size make adequate provisions and mark the intersection of the cross ribs can
cancel.
10.2 Subject to the above, steel packaging, marking and quality certification should be consistent with the relevant provisions of GB/T 2101's.
Appendix A
(Informative)
Characteristics of heat treatment of steel
Characteristics of heat treated steel having a macroscopic metallurgical, Vickers hardness and other features.
A.1 macroscopic metallography
A.1.1 Application sawing machine reinforced cut into cylindrical specimens, the specimen shall be subjected to high temperatures.
A.1.2 cross section of the sample shall be grinding, polishing.
A.1.3 with 2% to 5% nitric acid - alcohol solution or other suitable solution of the sample is etched, etching time is preferably 5s ~ 10s.
A.1.4 heat treated steel macro metallurgical characteristics. a sample group full circle round the periphery appears continuous tempering organization, see Figure A.1.
Figure A.1 heat treated steel metallurgical characteristics of the macroscopic
A.2 Vickers hardness
A.2.1 Application sawing machine reinforced cut into cylindrical specimens, the specimen shall be subjected to high temperatures.
A.2.2 cross section of the sample shall be grinding, polishing.
A.2.3 press polished surface centerline as the specimen measured at the center point (Hv0), and determines from the edge of the measuring point in the sample group rounded edges 2mm range
(Hv), as shown in FIG A.2.
Vickers hardness measuring point Figure A.2 reinforcement
A.2.4 according to GB/T 4340.1 Vickers hardness test were measured Vickers hardness Hv0, Hv.
A.2.5 heat treated steel Vickers hardness characteristics. deviation between the measured Vickers hardness (Hv-Hv0) in 40Hv above.
A.2.6 difference between the Vickers hardness (Hv-Hv0) in 50Hv or less, according to A.1 characteristics prevail.
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