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TP304/TP304L

  • Material

    TP304, UNS S30400, 1.4301, X5CrNi18-10

    TP304L, UNS S30403, 1.4307, X2CrNi18-9


  • Overview

    304 steel belongs to low carbon Austenitic type stainless steel, has general intergranular corrosion resistance and excellent corrosion resistance and cold working stamping performance. It has strong corrosion resistance to oxidizing acid (such as nitric acid), and has certain corrosion resistance to alkali solution and most organic and inorganic acids.


    304L steel is an ultra-low carbon austenitic stainless steel with superior intergranular corrosion resistance, and the weldments are not prone to knife edge corrosion in the heat affected zone. It has good corrosion resistance in different temperature and concentration of a variety of strong corrosive media (such as nitric acid, most of the organic and inorganic acid aqueous solution, phosphoric acid, alkali, etc.). It has high thermal stability in air below 850℃. It also maintains good mechanical properties in low temperature environment. Its cold deformation, deep stamping, cutting, weldability are very good.

  • Application

    TP304 is used in almost most industrial environments - from decoration, construction industry, basic utility equipment to complex components, subassemblies in the chemical, petrochemical, automotive, machinery, food, and even marine, aerospace and railway industries. As stainless steel, it withstands the working environment and contact with steam, water, ammonia, external conditions, hydrogen sulphide, liquid fuels, sulphur, nitric acid, paints, phenols, some ammonium compounds and sulphates. It is suitable for contact with substances present in food production - tartaric acid, citric acid, oxalic acid, acetic acid, salicylic acid, vegetable preparations, alcohols, fermented products and other organic substances.


    TP304 is less able to work in the environment of formic acid, lactic acid, sometimes also acetic acid at higher temperatures/concentrations, semi-finished products for the production of cleaning powders (e.g. borax), most chlorides and inorganic acids, also sulphuric acid, hydrogen chloride, hydrogen fluoride, fluorine, potassium carbonate, sodium carbonate, ammonium nitrate. This also applies to certain liquid metals at high temperatures - lead, cadmium, zinc, and alumina.


    The applications of TP304L are mostly the same as TP304.

  • Chemical Composition

    TP304 as per ASTM A269

    wt%

    C

    Si

    Mn

    P

    S

    Cr

    Ni

    Mo

    18.00

    8.00

    0.08

    1.00

    2.00

    0.045

    0.030

    20.00

    11.00


    TP30L as per ASTM A269

    wt%

    C

    Si

    Mn

    P

    S

    Cr

    Ni

    Mo

    18.00

    8.00

    0.035

    1.00

    2.00

    0.045

    0.030

    20.00

    12.00



  • Mechanical Property

    Temper

    TP304

    TP304L

    Tensile Rm

    75

    ksi (min)

    70

    ksi (min)

    Tensile Rm

    515

    MPa (min)

    485

    MPa (min)

    R.p. 0.2% Yield

    30

    ksi (min)

    25

    ksi (min)

    R.p. 0.2% Yield

    205

    MPa (min)

    170

    MPa (min)

    Elongation (2" or 4D gl)

    35

    % (min)

    35

    % (min)

  • Heat Treatment and Hardness

    Solution treat temperature: 1040°C (1900°F)

    Hardness: max. 192 HBW or 200 HV or 90 HRB

  • Available Process

    (1) Cold worked

    (2) Cold worked and bright annealed

    (3) Cold worked, annealed and pickled

    (4) Cold worked, polished (MP, EP etc.)

    (5) Cold worked, bright annealed, polished (MP, EP etc.)

  • Product Forms

    (1) Capillary tubes

    (2) Thin wall & Ultra thin wall seamless tubes

    (3) Thick wall and ultra thick wall seamless tubes

    (4) Precision conical seamless tubes

    (5) EP tubes

    (6) Small caliber precision seamless tubes

    (7) Profiled seamless tubes

    (8) Bourdon tube

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