GB/T 26306-2010 English PDF (GB/T26306-2010)

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GB/T 26306-2010: Free-cutting copper alloy rod and bar
GB/T 26306-2010
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.150.30
H 62
Free-cutting copper alloy rod and bar
ISSUED ON: JANUARY 14, 2011
IMPLEMENTED ON: NOVEMBER 01, 2011
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Requirements ... 5
4 Test methods ... 13
5 Inspection rules ... 15
6 Marks, packaging, transportation, storage and quality certificate ... 16
7 Contract (or purchase order) ... 17
Annex A (informative) Testing method for cutting ... 18
Annex B (informative) Designations of this Standard and corresponding designations
of US ASTM standards ... 23
Free-cutting copper alloy rod and bar
1 Scope
This document specifies the requirements, test methods, inspection rules and marks,
packaging, transportation, storage, quality certificate and contract (or purchase orders),
etc. for free-cutting copper alloy rod and bar.
This Standard applies to free-cutting copper alloy rod and bar.
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 228-2002, Metallic materials - Tensile testing at ambient temperature
GB/T 2828.1, Sampling procedures for inspection by attributes - Part 1: Sampling
schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
GB/T 3310, Ultrasonic testing method of copper and copper alloy bars
GB/T 5121 (all parts), Methods for chemical analysis of copper and copper alloys
GB/T 5231-2001, Wrought copper and copper alloys chemical composition limits
and forms of wrought products
GB/T 6394, Determination of estimating the average grain size of metal
GB/T 8888, Wrought heavy non-ferrous metal products - Packing, marking,
transporting, storing and quality certificate
GB/T 10119, Determination of dezincification corrosion resistance of brass
GB/T 10567.2, Wrought copper and copper alloy - Detection of residual stress -
Ammonia test
GB/T 26303.2, Measuring methods for dimensions and shapes of wrought copper
and copper alloy - Part 2: Rod, wire and profile
YS/T 336, Methods of fracture test for tube and rod of copper and copper alloys,
nickel and nickel alloys
The cross-section shapes of the product are shown in Figure 1. Markings are indicated
in the order of product name, designation, state, accuracy level, specification and
standard number. Marking examples are as follows:
Example 1: Round rods and bars that are manufactured from HPb59-2, the supply state
is Y2, the accuracy level is high, the outside diameter is 20 mm and the length is 2000
mm, are marked as:
Round rod and bar HPb59-2 Y2 high 20×2000 GB/T 26306-2010
Example 2: Square rods and bars that are manufactured from HBi59-1, the supply state
is Y, the accuracy level is high, the side length is 20 mm and the length is 2000 mm, are
marked as:
Square rod and bar HBi59-1 Y high 20×2000 GB/T 26306-2010
Example 3: Rectangular rods and bars that are manufactured from HSi75-3, the supply
state is Y2, the accuracy level is common, the height is 25 mm, the width is 40 mm and
the length is 2000 mm, are marked as:
Rectangular rod and bar HSi75-3 Y2 40×25×2000 GB/T 26306-2010
Example 4: Regular hexagonal rods and bars that are manufactured from QTe0.3, the
supply state is Y, the accuracy level is high, the side-to-side distance is 10 mm and the
length is 1000 mm, are marked as:
Regular hexagonal rod and bar QTe0.3 Y high 10×1000 GB/T 26306-2010
3.2 Chemical composition
The chemical composition of rods and bars whose designations are HPb59-1, HPb59-
3, HPb60-2, HPb62-3, HPb63-3, QTe0.5, QSn4-4-4 shall meet the requirements for the
corresponding designations in GB/T 5231. The chemical composition of other
designations shall comply with the provisions in Table 2 (see Annex B for rod and bar
designations and corresponding designations in American ASTM standards).
Annex A
(informative)
Testing method for cutting
A.1 Scope
This appendix specifies the test methods for cutting of copper and copper alloys.
This appendix is applicable to the testing of cutting of copper and copper alloys.
A.2 Principle
Take the cutting index of lead brass HPb62-3 (US C36000) as 100%. Do a comparative
test with the specimen to be tested. Take the cutting force measured during the specimen
cutting test or the cutting force calculated from current and voltage values as the main
evaluation index.
A.3 Main equipment
Automatic lathe, cutting force dynamometer or EX power monitor, alloy tool, vernier
caliper, ruler.
A.4 Specimen
A.4.1 Comparison specimen
For HPb62-3 (US C36000) alloy straight rod and bar with a length of 200 mm and a
diameter of ϕ25 mm, the standard composition is: Cu 61.5%, Zn 35.5%, Pb 3.0% (the
expanded uncertainty of each element is 0.06%).
A.4.2 Specimen to be tested
Make a specimen to be tested with the same state, straightness and shape as the
comparison specimen.
A.5 Test methods and steps
There are two test methods. Follow Method One when using the cutting force
dynamometer. Follow Method Two when using the EX battery monitor.
A.5.1 Method One
Put the comparison specimen HPb62-3 and the specimen to be tested on the same
automatic lathe equipped with a cutting force dynamometer. Carry out the cutting
detection test according to the same test conditions (rotational speed of lathe spindle,
cutting speed, alloy tool and its parameters, feed rate, cutting state, ambient temperature,
etc.). At least three sets of average data of cutting force F (including axial force FX,
radial force FY and main cutting force FZ) are collected for each specimen. Each set of
test data collects more than 50 points.
Determine the cutting parameters: 1) Fine turning: the cutting amount is 0.5 mm; the
rotating speed is 820 r/min; the cutting speed is 0.260 mm/r. 2) Rough turning: the
cutting amount is 1 mm; the rotating speed is 610 r/min; the cutting speed is 0.260 mm/r
(cutting parameters can be selected from fine turning or rough turning).
A.5.2 Method Two
A.5.2.1 Put the comparison specimen HPb62-3 and the specimen to be tested on the
same automatic lathe equipped with EX power monitor. Carry out the cutting detection
test according to the same test conditions (rotational speed of lathe spindle, cutting
speed, alloy tool and its parameters, feed rate, cutting state, ambient temperature, etc.).
A.5.2.2 Test steps
A.5.2.2.1 Turn on the lathe. Perform idling. Record the no-load current from the EX
power monitor for future use.
A.5.2.2.2 Determine the cutting parameters: 1) Fine turning: the cutting amount is 0.5
mm; the speed is 820 r/min; the cutting speed is 0.260 mm/r. 2) Rough turning: the
cutting amount is 1 mm; the rotating speed is 610 r/min; the cutting speed is 0.260 mm/r
(cutting parameters are selected from fine turning or rough turning).
A.5.2.2.3 Conduct the cutting test. For each specimen, record the data of three-phase
current Ia, Ib, Ic and three-phase voltage Ua, Ub, Uc at the same time point. Collect at
least ten sets of data.
A.5.2.3 Calculation method
The power consumed in the cutting process is called ...