Q/BS 5331-91

1 varieties

The brand, status and specifications of the product shall conform to the provisions of Table 1.

Table 1

Product Brand Supply Status Specification mm

Diameter Length

TA1, TA2, TA3, TA4, TC11 Hot Rotary Forging (R) 5.0-8.0 300-1500

2 Product size and allowable deviation

2.1 The dimensions and allowable deviations of the products shall conform to the requirements of Table 2.

Table 2 mm

Allowable deviation of diameter, length and length

5.0-6.5 +0.10 300-1500+5

Zero

> 6.5-8.0 +0.15 300-1500+5

Zero

Note: The length of fixed length and double length should be within the range of variable length. The length of double ruler should be taken into account when cutting section, each cut is 5 mm.

2.2 The bar should be straight and its bending degree should not exceed 6 m m/m.

2.3 The non-roundness of the bar shall not be greater than its diameter tolerance.

2.4 The two ends of the bar should be sawed flat and the cutting inclination should be no more than 3 mm.

3 Technical Requirements

3.1 The chemical composition of bars shall conform to the requirements of GB/T 3620 and Table 3.

3.2 When the user requests and indicates in the contract, the measured data of room temperature tensile strength &b and elongation &5 are provided in batches. The state of sample is the same as that of product delivery.

3.3 Cracks, blowhole, metal or non-metal inclusions, tail shrinkage, segregation affecting use and other metallurgical defects visible to the naked eye shall not be allowed at transverse or low magnification of bars.

3.4 There should be no cracks, folds and other defects on the surface of bars. Local defects should be cleared, and the depth of clearance should not exceed half of the diameter tolerance; slight defects such as scratches, indentations and hammer marks should be allowed, which should not exceed half of the diameter tolerance.

Table 3

Major ingredients,% impurities,% less than or equal to

Ti Al Mo Zr Si Fe C N H O Other Elements

Single summation

TC11 base 5.8-7.02.8-3.80.8-2.0.20-0.350.250.100.05 0.012 0.150.1 0.3

Note: Other elements are not inspected under normal circumstances, but it should be guaranteed that they can be inspected when required by the buyer and specified in the contract. The inspecting elements include: Cu, Cr, Sn, Mn, V.