Q/BQB 501-2019 English PDF (QBQB501-2019)

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Q/BQB 501-2019: Dimension, shape, mass and tolerance for wire rods
Q/BQB 501-2019
ENTERPRISE STANDARD OF
BAOSHAN IRON AND STEEL CO., LTD
Replacing Q/BQB 501-2018
Dimension, Shape Mass and Tolerance for Wire Rods
ISSUED ON: FEBRUARY 02, 2019
IMPLEMENTED ON: APRIL 10, 2019
Issued by: Baoshan Iron and Steel Co., Ltd.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Classification and Code ... 4
4 Dimension, Shape and Allowable Deviation ... 4
5 Weight ... 5
6 Coil Dimension ... 7
7 Inspection Positions ... 7
8 Numerical Rounding-off Rules ... 7
Dimension, Shape Mass and Tolerance for Wire Rods
1 Scope
This Standard specifies the dimension, shape, weight and allowable deviation of the
wire rods.
This Standard is applicable to various wire rods with diameter of 5mm~28mm and
produced by Baoshan Iron and Steel Co., Ltd.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
GB/T 8170-2008 Rules of Rounding off for Numerical Values and Expression and
Judgement of Limiting Values
3 Classification and Code
Ordinary precision Level-A
Higher precision Level-B
Advanced precision Level-C
4 Dimension, Shape and Allowable Deviation
4.1 The nominal diameter and cross-sectional area of the wire rod shall meet the
requirements in Table 1.
4.2 The allowable deviation of diameter and out-of-roundness of the wire rod shall
comply with the corresponding precision levels specified in Table 1. Out-of-roundness
refers to the difference between the maximum diameter and the minimum diameter on
the same section of the wire rod.
4.3 The precision levels shall be specified in the contract. If it is not specified, it shall
be executed according to Level-A precision.
4.4 According to the requirements of the purchaser, through the negotiation between
the supplier and the purchaser, wire rods of other sizes than those specified in Table 1
may be supplied. The allowable deviations are based on the adjacent smaller
specifications in Table 1.
5 Weight
5.1 Wire rods are delivered by actual weight. Refer to Table 1 for the theoretical weight
of the wire rods.
5.2 Each coil consists of a whole wire rod.
5.3 The weight of a single coil shall meet the requirements of the following
corresponding groups; and the coil weight groups (I, II, or III) shall be specified in the
contract. If it is not specified, it shall be carried out according to Group-I coil weight:
--- Group I: The coil weight shall generally be 1900kg ~ 2400kg. Allow the coil weight
of 10% the number of coils per delivery lot (two coils less are allowed to be two
coils) to be less than 1900kg, but no less than 1000kg;
--- Group II: The coil weight shall generally be 1600 kg~2100 kg. Allow the coil
weight of 10% the number of coils per delivery lot (two coils less are allowed to
be two coils) to be less than 1600kg, but no less than 1000kg;
--- Group III: The coil weight shall generally be no less than 1000 kg. Allow the coil
weight of 5% the number of coils per delivery lot (two coils less are allowed to be
two coils) to be less than 1000kg, but no less than 800kg.
5.4 According to the requirements of the purchaser, with the agreement between the
supplier and the purchaser, wire rods with other coil weights can also be supplied.