GB 27704-2011Steel nails (English PDF)

5.1 Shape

Pinning generally consists of the nut, shank and sharp nails three parts. Nail shape mark in accordance with Table 1, Table 2 should be the shape of the shank mark, nail tip Shape in accordance with Table 3 mark.

Table 1 nail shape

Nail shape symbol shape (for example) A pocket cap Cup-shaped cap B C C-shaped cap D D-shaped cap Drum head shaped cap G

Table 1 (continued)

Nail shape symbol shape (for example) Flat-shaped hat P H-shaped pattern cap Q spherical cap T-shaped hat T Round table cap Y Conical cap Z

Table 2 Shank shape

Shank shape symbol shape (for example) Square rod F the ring-shaped lever HW Helical-shaped rod LX Chute-bar XC AeroBars Y Crimped-bar YH Straight slotted shaft ZC

Table 3 nail tip shape

Nail tip shape sign shape (Example) Lateral C-shaped tip Bullet-shaped tip D Diamond tip L no sharp W Wedge pointed X Tapered tip Z

5.2 Specifications

Nail specifications Arabic numerals combination shank diameter and length of the shank is marked (in mm); shank diameter and length of the shank Between use of the symbol "×" connection; nail should follow the specifications in Appendix A, Appendix B, Appendix C, Appendix D, Appendix E, Appendix F, Appendix G, Appendix H, Appendix I, Appendix J, Appendix K, Appendix L, M and Appendices Appendix N provisions; special specification orders when specified in the contract.

5.3 Labeling method

5.3.1 Mark mode

The type and shape of the nail marks, with the Chinese species, nail shape characteristics of the Chinese phonetic alphabet and number combinations nail specifications, in accordance with

Table 1, Table 2 and Table 3 mark. In general, the pattern shape steel nails cap, shank shape of a round bar, nail tip shape diamond tip shape

Feature can be omitted when labeling.

5.3.2 Markup order

Tag order in accordance with the type of nail products, nail shape, size, shape of the shank, the shape of the nail tip order sequentially. Nail surface Management mode, using Chinese characters in front of the species marked out. See examples.

Example.

Plating Pallet nails species Nail shape 2.68 Shank diameter × 50.8 Shank length LX Shank shape Nail tip shape He said. Shank diameter of 2.68mm, shank length 50.8mm, flat-shaped nut, helical rod-shaped nails, nail without sharp plating tray.

6.1 Raw materials

Manufacturing wire nails commonly used as a raw material. The use of low-carbon steel nails raw, raw materials shall comply with GB/T 701's;

Use high-quality carbon steel nail raw, raw materials shall comply with GB/T 4354's. Stainless steel nail raw, raw materials shall comply with GB/T 4232; or the use of other materials than the above criteria.

6.2 Shape

6.2.1 Nut

Screw cap does not allow significant skew and crack; round nail ovality should not exceed 16% of the nominal shank diameter; nail shape should follow According to Appendix A, Appendix B, Appendix C, Appendix D, Appendix E, Appendix F, Appendix G, Appendix H, Appendix I, Appendix J, Appendix K, Appendix L, M and Appendix N the provisions of appendix.

6.2.2 Shank

Shank should ensure straight nail length greater than 20mm, the bending of delta should be less than 0.005L, in units of mm, shown in Figure 1; long Less than or equal to 20mm steel nails, visual should be no significant bending. Shank shape should comply with Annex A, Annex B, Appendix C, Appendix D, Appendix E, Appendix F, Appendix G, Appendix H, Appendix I, Appendix J, Appendix K, Appendix L, M and Appendices Appendix N of the rules.

1 Shank curvature

6.2.3 Nail tip

Nail tip should not significantly skew, there should be flat or sharp fins; nail tip angle should be in accordance with Appendix A, Appendix B, Appendix C, Appendix D, Appendix E, Appendix F, Appendix G, Appendix H, Appendix I, Appendix J, Appendix K, Appendix L, M and Appendices Appendix N of the rules.

6.2.4 Eccentricity

Eccentricity E should be less than (0.1 × d) mm, in millimeters, as shown in Fig.

Figure 2 eccentricity

6.3 Dimensions

Different types and specifications of nail should be sized in accordance with Appendix A, Appendix B, Appendix C, Appendix D, Appendix E, Appendix F, Appendix G, Appendix H, Appendix I, Appendix J, Appendix K, Appendix L, M and Appendices Appendix N of the rules.

6.4 Surface quality

6.4.1 Appearance

Nail appearance should be smooth, no significant injuries or glitches, not rust.

6.4.2 Surface Treatment

6.4.2.1 nail surface may be electrochemical plating process. Electrochemical coating surface should be uniform and shiny, firmly attached, there should be no blistering, off Fall, black spots or drain plating defects such as partial coating thickness should not be less than 0.003mm, in line with GB/T 5267.1 requirements.

6.4.2.2 nail surface can be mechanically galvanized. Coating the surface should be seamless plating, no black spots, no peeling, uniform and smooth, firmly attached; zinc Layer thickness should not be less than 0.005mm, the surface should be consistent with JB/T 8928 requirements. Galvanized surface treatment machinery, as long as the zinc layer thickness not less than the predetermined value, the plated surface allows the presence of dark or light gray color uneven areas.

6.4.2.3 nail surface can be hot dip galvanized. Zinc plating layer surface should be seamless, no black spots, no peeling, no zinc thorns, uniform and smooth, attachment Solid, no adhesion to each other; zinc coating thickness should not be less than 0.035mm, comply with GB/T 13912 of. After hot-dip galvanized table Surface, as long as the zinc coating thickness not less than a predetermined value, the plated surface allows the presence of dark or light gray color uneven areas.

6.4.2.4 nail surface coatings can be used for surface coating; layer should cover even and firm, should be seamless coating, no loss.

6.5 Mechanical properties

6.5.1 Tensile strength

6.5.1.1 The use of low-carbon steel nail tensile strength shall meet the requirements of Table 4.

Table 4 Tensile Strength Table

Nominal diameter

tensile strength

MPa

> 880 to 1320 0.80 to 1.20 > 1.20 1.80 785 ~ 1220 ~ > 1.80 2.50 735 ~ 1170 ~ > 2.50 3.50 685 ~ 1120 ~ > 590 to 1030 3.50 to 5.00 > 5.00 - 10.00 540 - 930 Note. The organization also produced according to customer agreement.

6.5.1.2 Use of high-quality carbon steel materials shall comply with the tensile strength of steel nails YB/T 5303's.

6.5.1.3 The use of stainless steel nail tensile strength shall comply with GB/T 4232's.

6.5.2 Hardness

After heat treatment to obtain a higher hardness of nails, the shank diameter greater than 2.2mm steel nail hardness should not be less than 49HRC; shank diameter Less than or equal to 2.2mm steel nail hardness should not be less than 45HRC.

Note. The nail hardness without heat treatment is not required.

6.5.3 Bending angle

After heat treatment to obtain a higher hardness nail bending angle should satisfy not break when bent 30 °.

Note. The non-heat treated nail bending angle is not required.

6.6 Net content

Net content 6.6.1 single physical package Net weight single physical package should be consistent with the representation on the packaging; marked net content and the actual content of not greater than the difference between Tables 5 and 6 the allowable amount of the shortage of provisions.

Table 5 Net content allows shortfall

Each box (box) within the nail Net content (Qn) Allow shortfall (T) Percentage Allow shortfall 0 to 50 (50) 9 -50 to 100 (including 100) - 4.5 100 to 200 (including 200) 4.5 -200 to 300 (including 300) - 9 300 to 500 (including 500) 3 -500 to 1000 (including 1000) --15 1,000 to 10,000 (including 10,000) 1.5 -10,000 to 15,000 (including 15,000) - 150 15,000 to 50,000 (including 50,000) 1 -when Qn<=1kg, T-bit value is 0.01g to 0.1g rounding; when Qn > 1kg time, T-bit values rounded to 0.1g g.

When a single pin net content quality is greater than a predetermined tolerance, in order to limit the quality of a pin.

Table 6 Number of scale allow a shortage of units for the root

(Box) within the pin number every box (Qn) allows shortfall (T) Qn<=50 0 Qn > 50 Qn × 1% when Qn > 50, the number of allowed shortfall calculated result is not an integer rounded; after rounding if greater than 1%, as allowed shortfall.

6.6.2 Allows physical bulk packaging net content

The same number of deliveries of the same type, the average actual net content of prepackaged with the specifications of the nail should be greater than or equal to its net content labeling.

The actual net content of prepackaged single sampling inspection and labeling of the nail of the difference between net content shall not be larger Tables 5 and 6 provisions allow short Ullage.

7.1 Raw materials

Nail manufacturing and chemical composition of raw materials used should check the manufacturer of the nail plate with the supply provided by the batch tested or checked rod Measurement report.

7.2 Shape

7.2.1 Nut

Visually inspect and measure calculations. Nail ovality equal nail diameter measurement difference between maximum and minimum values; after the decimal places Two.

7.2.2 Shank

Visually inspect and measure calculations. When measuring the curvature of the shank, the nail should be placed on measuring instrument bent nail tip and shank cutting part on the measured curve Anchor outside the instrument, gently rotating pin, so that the most prominent part bending upward, should be used in line with GB/T 6311 regulations, indexing value 0.01mm dial indicator to measure the value of the highest and lowest points. 3, the difference between the highest and lowest values of the binary point value One of the values, that is, the curvature of the shank, the value to two decimal places.

3 Shank curvature measurement

7.2.3 Nail tip

Visually inspect and measure calculations. Shall be consistent with the provisions of JJG33 universal angle ruler or magnification of not less than 10 times the projector into Line measurement.

7.2.4 Eccentricity

Use in line with GB/T 21389 regulations, indexing vernier caliper measurement is 0.02mm and calculate eccentricity, it shall comply with 6.2.4.

4, according to the following formula.

E = S1-S22

Where.

E --- eccentricity millimeters (mm);

S1 --- nail edge departs from the side of the shank of the standoff distance, in millimeters (mm);

S2 --- nail shank smallest deviation from the edge of the side of the standoff distance, in millimeters (mm).

Calculation result to two decimal places.

Figure 4 eccentricity calculation method

7.3 Dimensions

It should be used in line with GB/T 1216 regulations, dividing the value of the outer diameter of 0.01mm micrometer to measure the diameter of the shank; should be used in line with GB/T 21389 regulations, indexing vernier caliper measurement of other dimensions is 0.02mm.

7.4 Surface quality

7.4.1 Nail surface quality without surface treatment

Without surface coating, plating nail, using visual methods and hand-touch inspection.

7.4.2 Surface-treated nail surface quality

7.4.2.1 nail through the surface of the electrochemical plating, coating thickness and surface quality should be measured in accordance with the provisions of GB/T 2973's.

7.4.2.2 nail through the surface of mechanically galvanized plating thickness and surface quality should be measured in accordance with GB/T 8928 regulations.

7.4.2.3 nail through the surface of hot-dip galvanized coating thickness and surface quality should be measured in accordance with the provisions of GB/T 13912 of.

7.4.2.4 surface coating treatment and electrochemical plating, mechanical galvanization, hot dip nail treatment, under normal operating conditions should not have flaking or peeling phenomenon. Percussion and bending were then plated coating produced flaking and peeling phenomenon, does not indicate coating, the coating adhesion is not good. For parties with special Specific requirements, must be tested for adhesion, negotiated by the supply and demand sides.

7.5 Mechanical properties

7.5.1 Tensile strength

In accordance with the provisions of GB/T 228, with the tensile tester to measure.

7.5.2 Hardness

In accordance with the provisions of GB/T 230.1-2004 were measured using a Rockwell hardness tester.

7.5.3 Bending angle

When the bending angle measurement should nail in the vise, hand hammer hitting a lateral move or bend steel pipe, measuring the bending angle.

If the shank broken, nails need to correct the docking bar and then measuring the bending angle.

7.6 Net content

Use minimum scale value is less than the net content of the product packaging showing the regulations allow shortfall weighing apparatus for measurement.

8.1 Inspection classification

Inspection is divided into type inspection and factory inspection.

8.2 Test order

When the test should be the first non-destructive to the sample size, appearance and other items inspection, after passing inspection and destructive hardness Bending angle test project.

8.3 Type inspection

One of the following situations occurs, the type of inspection should be carried out.

a) new products or old products to the plant identification;

b) production, such as materials, processes, product mix major changes, could cause the performance variation;

c) production, cumulative production of certain batches spot checks;

d) Product Discontinuance more than one year, the production recovery;

e) factory inspection results are quite different and the last type test results.

8.4 Test Project

Type test and factory inspection items are shown in Table 7.

Table 7 type test and factory inspection items table

No Item factory inspection type test requirements Test Method No. reg reg number Raw materials - - 6.1 7.1

2 Shape - - 6.2 7.2

3 Dimensions - - 6.3 7.3 4 surface quality - - 6.4 7.4 5 tensile strength - - 6.5.1 7.5.1 6 hardness - - 6.5.2 7.5.2 7 bending angle - - 6.5.3 7.5.3 8 net content - - 6.6 7.6 Note. "-" is always checked; "-" to select items.

8.5 Inspection and bulk sampling program

8.5.1 Test batch (N)

Net content inspection batch determined in accordance with the provisions of JJF1070-2005; test batch of other items in accordance with GB/T 2828.1-2003 shall be determined. Nails should test batches, each batch from the same species, the same size, the same production process conditions and delivery status of steel Nail composition.

8.5.2 Test level

8.5.2.1 Substandard classification

According to the provisions of GB/T 2828.1-2003 in 3.1.5, nail substandard classification Table 8.

Table 8 substandard classification

Category nonconformity hardness Bending angle net weight A1 raw materials size shape tensile strength C surface quality According to GB/T 2828.1-2003 10.1 provisions for Class A steel nails, test level class B items for a particular test failed Levels (S-2); Class C non-conformance test level for the general test level (I).

8.5.2.2 Acceptance quality limit (AQL)

In accordance with the provisions of GB/T 2828.1-2003 in Chapter 5, hand tools, hammering nails with the acceptance quality limit (AQL). A sub-category Grid 1.0, Class B and Class C unqualified 2.5; power tool hit the nail with the acceptance quality limit (AQL). A class failed to 0.65, B Class A and C failed 1.5.

8.5.2.3 Sampling Plan

Nail normal inspection determines a sampling program in accordance with the provisions of GB/T 2828.1-2003's. When the test batch (N) is 150 001 ~ 500 000, the pin test a sampling program examples are shown in Table 9.

Table 9 pin test sample a sampling program

Pinning

species

Substandard

classification

test

Level

Sample size

Character code

The reception quality Quantity is limited (AQL) Normal inspection tightened inspection reduced inspection Sample size (N) Receiving data (Ac) Rejection number (Re) Sample size (N) Receiving data (Ac) Rejection number (Re) Sample size (N) Receiving data (Ac) Rejection number (Re) Hand thump with nails A S-2 E 1.0 13 0 1 20 0 1 5 0 1 B S-2 E 2.5 20 1 2 32 1 2 13 1 2 C I M 2.5 315 14 15 315 12 13 125 8 9

Table 9 (continued)

Pinning

species

Substandard

classification

test

Level

Sample size

Character code

The reception quality Quantity is limited (AQL) Normal inspection tightened inspection reduced inspection Sample size (N) Receiving data (Ac) Rejection number (Re) Sample size (N) Receiving data (Ac) Rejection number (Re) Sample size (N) Receiving data (Ac) Rejection number (Re) Power tool with striking with nails A S-2 E 0.65 20 0 1 32 0 1 5 0 1 B S-2 E 1.5 32 1 2 13 0 1 20 1 2 C I M 1.5 315 10 11 315 8 9 125 6 7

8.5.2.4 Normal, tightened and reduced inspection

8.5.2.4.1 in accordance with the provisions of GB/T 2828.1-2003 in Chapter 9, nail normal inspection tests are used.

8.5.2.4.2 When using normal inspection, if the situation GB/T 2828.1-2003 in Chapter 9 of the transfer rule satisfy the conditions occur, Corresponding transfer to tightened inspection, reduced inspection or suspend inspection.

8.5.2.5 Net content inspection

In the same species, the same size, the same production batch of the finished product packaging (box), the net weight and the number of samples. Single prepackaged Suppliers Products marked difference between the net weight and its actual content greater than the permitted number of pieces and the shortfall of the average actual content of the sample, should be consistent JJF1070-2005 specified in 4.3.2.

Table 10 the number of samples in the sample net content requirements

Batch tests

Extracting sample size (n) Allows more than 1 and less than or equal to 2 times Allow the number of shortfall Allow greater than 2 times the amount of shortage of the number allowed 11 ~ 501000 51 ~ 991 310 100 ~ 5005030 501 ~ 32,008,050 More than 320,012,570

8.6 Determine the rules

8.6.1 A1 class only qualified suppliers provided the batch test rod or test reports prove a one-time check, not by GB/T 2828.1-2003 execution.

8.6.2 sample of test items, the one does not meet any of the criteria, it is determined that the product failed.

9.1 Packaging

Packaging should ...