TU 14-3-190-2004. Seamless steel tubes
Buy seamless steel pipes for boiler plants and pipelines, requirements for which are stipulated in the TU 14−3-190−2004, the company offers Electrocentury-steel. Apply cost-effective prices from the manufacturer. The supplier provides timely delivery of metal to any address set by the client.
These technical conditions apply to pipes, seamless hot-, cold — and warm from steel grades 10, 20, 20-PV. Products are used for boiler plants and pipelines with pressure steam and hot water to 6.4 MPa temperatures up to 400o C.
- forged and rolled billets in the GATS 3−009, OST 14−21, TU 14−1-1529, 14−1-1545 TU, TU 14−1-1787, 14−1-2228 TU, TU 14−1-2560, THE 14−1-5185;
- of continuous cast billet production OJSC «Volzhsky pipe plant» on the other 14−1-4944, 14−1-4992 TU, TU 14−1-5319 and JSC «NTMK» on the other 14−1-5472;
- of vacuum open-hearth ingot manufactured by JSC «Nizhnedneprovsky tube rolling plant» (Ukraine).
Assortment of pipes provided for TU 14−3-190−2004, limited to certain dimensions of the outer/inner diameter and wall thickness.
Hot tubes are made with a diameter of 20…426 mm with wall thickness of 2.5…18 mm in the grades prescribed by GOST 8732, and a diameter of 51 mm with theLSINoah wall 2.5 mm, 2.6 mm and 2.8 mm. Cold — and warm-deformed tubes made in the sizes in the assortment GOST 8734. In coordination with the customer can be manufactured holodnokatny — fied pipe sizes in the assortment GOST 8732. Delivery of pipes of intermediate size in the range GOST 8732, GOST 8734.
The list of dimensions of seamless steel pipes intended for boiler plants and pipelines, are given in the table.
In parentheses are the permissible values of tubular steel.
The company Electrocentury-steel offers to buy seamless steel pipes for boiler plants and pipelines, technical requirements I which conform to the provisions of the TU 14−3-190−2004. Products are sold on producer prices. Supplier guaranteed prompt delivery of rent at any address specified by the customer.
Pipes made from steel grades 10 and 20 with the chemical composition according to GOST 1050, of steel grade 20-PV — TU 14−1-5185. Pipes shall be supplied in heat treated condition. Allowed the normalization of the hot-deformed pipes with rolling heating. Mechanical properties of pipe metal at room temperature shall be as specified in the table below:
|not less than|
Note 1. In the case of determination of mechanical properties on samples in the form of a segment or of a segment of pipe of total cross section relative narrowing is not defined. Note 2. In the case of determining the mechanical properties of the pipes may reduce elongation of 3%.
Note 3. Test for impact strength is carried out on pipes with a wall thickness of 6 mm or more.
Note 4. Allowed the reduction of impact values on the same sample at
- J/cm (1 kgsm/cm) from the established norms provided that the average value of test results of samples taken from one tube is not below the settion rules. The yield strength of the metal pipe at a temperature of 3500 C should not be less than:
- for steel 10 — 130,0 MPa (of 13.0 kgf/mm2);
- for steels 20 and 20-PV — 160,0 MPa (16,0 kgf/mm2).
The manufacturer of the pipes is allowed to ensure the yield strength of the metal pipe at a temperature of 3500 C without testing on the basis of compliance with the production technology of tubes and the results of the periodic tests.
Piping without leak detection must be able to withstand a test hydraulic test pressure (p, MPa), calculated according to the formula given in GOST 3845, if the permissible stress (σ, MPa), equal to 40% of the tensile strength for this steel grade.
The manufacturer is permitted to ensure that the delivered pipes will stand the test of trial hydraulic pressure without testing.
In the macrostructure of the metal pipes are not permitted rolled out: Pousada the porosity, subcortical bubbles of gas, bloat of crusts, cracks, delamination, flocs, foreign metal and non-metallic inclusions, visible without using the magnifying devices.
The manufacturer can ensure that the macrostructure of the metal pipes to the specified requirements without the control based on the results of 100%inspection of pipes. Control of macrostructure is carried out for pipes with a wall thickness of 12 mm or more.
Buy at affordable price from the manufacturer of rolled steel seamless pipe intended for use in boiler plants and pipelines, the company offers Electrocentury-steel. Supplier ensure prompt product delivery to any destination specified by the user.