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TU5.961-11215-99

Table 1 — Content of basic elements in alloys

Alloy grade Mass fraction of elements,%
  Aluminum Manganese Nickel Iron Zinc Copper The amount of impurities, no more
LTs40MtsZZh - 3.0−4.0 - 0.5−1.5 rest 55.0−58.0 2.0
BrA9Zh4N4 9.0−9.8 0.5−1.2 4.0−4.5 4.0−5.0 - rest 1,3
BrA7Mts14ZhZN2 7.4−7.9 13.0−15.0 1.5−2.5 2.5−3.5 - rest 1.5

Table 2 — Content of impurities in alloys

Alloy grade Mass fraction of elements,%
  Tin Silicon Lead Phosphorus Carbon Aluminum Antimony
LTs40MtsZZh 0.50 - 0.30 - - 0.80 0.10
BrA9Zh4N4 0.10 0.15 0.02 0.05 - - -
BrA7Mts14ZhZN2 0.10 0.15 0.05 0.05 0.05 - -

Note — Impurities not provided for in Table 2, as well as impurities given in it without indicating their permissible content in the alloy, take into account the total amount of impurities.

Table 3 — Mechanical properties of alloys

Alloy grade

Conditional Yield Strength,
MPa (kgf / mm 2)

Ultimate Tear Resistance,

MPa (kgf / mm 2)

Elongation, ,%

not less
LTs40MtsZZh 176 (18) 460 (47) 20
BrA9Zh4N4 245 (25) 607 (62) sixteen
BrA7Mts14ZhZN2 294 (30) 686 (70) eighteen

Notes:

1. Subject to obtaining the chemical composition and mechanical properties that meet the requirements of Tables 1, 2 and 3 of these specifications, the following values of properties that are not acceptance are guaranteed:

  • bend angle of brass ЛЦ40Мц3Ж — 25 °;
  • limit of corrosion-fatigue strength based on 10x10 6 cycles (on smooth round specimens with a diameter of 10−12 mm);
  • for bronze brands BrA9Zh4N4, BrA7Mts14Zh3N2 — 176 MPa (18 kgf / mm 2);
  • for brass grade LTs40Mts3Zh — 108 MPa (11 kgf / mm 2);
  • density:
  • for bronze BrA9Zh4N4 — 7600 kg / m 3 ;
  • for bronze grade BrA7Mts14Zh3N2 — 7400 kg / m 3 ;
  • for brass LTs40Mts3Zh — 8500 kg / m 3 .

2. The values of the ultimate tensile strength, depending on the chemical composition and the content of impurities (table 1, 2) can vary within the following limits:

  • for bronze grade BrA9Zh4N4 600−730 MPa (62−70 kgf / mm 2);
  • BrA7Mts14Zh3N2 680−830 MPa (70−85 kgf / mm 2);
  • for brass ЛЦ40МЦ3Ж 460−600 MPa (47−62 kgf / mm 2).

Table 5 — Selection of the type of heat treatment of fixed and adjustable pitch propellers

Alloy grade Possible sources of residual stress formation
Electro-arc or plasma cutting of edges and cutting off the profits of castings of blades and hubs Editing blades (zones C and B) Welding of surface defects of blades on the inner and outer surfaces of the hubs, on the flanges of the CPP blades
in zone B in zone C
LTs40MtsZZh general general or local general general or local
BrA9Zh4N4 general not allowed general not allowed
Bra7Mts14ZHZN2 general general or local general general or local

Notes

1. If, with the permission of the representative of the Russian Maritime Register of Shipping or the Customer, defects were welded in zone A, it is necessary to carry out a general thematic treatment regardless of the grade of the material.

2. In the case of correcting defects in zone C on the outer and / or inner surfaces of the screw hubs made of bronze BrA9Zh4N4 and BrA7Mts14Zh3N2, as well as the inner surface of the hubs made of brass LTs40Mts3Zh, heat treatment may not be carried out.