• Stainless Steel Chemical Composition and Mechanical Properties | SS Pipe Dimensions Sizes in OD & Inches | Pressure Rating | Schedule, Wall Thickness | Weight | Tolerances | Properties
  • Stainless Steel Chemical Composition and Mechanical Properties

    Stainless Steel Chemical Composition and Mechanical Properties | Learn More About SS Pipe Dimensions | Sizes in OD & Inches | Pressure Rating | Schedule, Wall Thickness & Weight | tolerances | properties

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    Stainless Steel Chemical Composition and Mechanical Properties

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    Chemical composition and mechanical properties of stainless steels to BS 6744

    Introduction

    BS 6744 Stainless steel bars for the reinforcement of and use in concrete was last published in 2009. This version is substantially the same as the 2001 edition but with the addition of 2 lean duplex steels 1.4162 and 1.4362.  These steels have the benefit of having a lower nickel content than the standard austenitic grades such as 1.4301 and 1.4401. They are therefore less prone to large variations in price.

    The grade designations are harmonized with the European steel number system, but currently there is no European standard for these products.
    The steels included in BS 6744 can also be found in BS EN 10088-3. The specified composition ranges are the same, but with some differences in the number of decimal places for the percentages of some elements shown. The ranges are however shown in this article. The tensile properties are also included in this article, but these are not expressed in the same way as in BS EN 10088-3, the general standard for stainless steel bars. The strength levels for bars to BS 6744 are expressed as the 'Grade' and indicate the proof strength of the steel. Guidance on steel number selection in a range of service environments is given in Annex B of the standard.

    The data given is not intended to replace that shown in individual standards to which reference should always be made.

    BS 6744 chemical composition table

    Grade
    Chemical composition (% by mass - max unless stated)
    - C Si Mn S Cr Ni Mo P N
    1.4301 0.07 1.0 2.0 0.03 17.0/19.5 8.0/10.5 - 0.045 0.11
    1.4436 0.05 1.0 2.0 0.015 16.5/18.5 10.5/13.0 2.5/3.0 0.045 0.11
    1.4429 0.03 1.0 2.0 0.015 16.5/18.5 11.0/14.0 2.5/3.0 0.045 0.12/0.22
    1.4162 0.04 1.0 4.0/6.0 0.015 21.0/22.0 1.35/1.75 0.1/0.8 0.040 0.20/0.25
    1.4362 0.03 1.0 2.0 0.015 22.0/24.0 3.5/5.5 0.1/0.6 0.035 0.05/0.20
    1.4462 0.03 1.0 2.0 0.015 21.0/23.0 4.5/6.5 2.5/3.5 0.035 0.10/0.22
    1.4501 0.03 1.0 1.0 0.015 24.0/26.0 6.0/8.0 3.0/4.0 0.035 0.20/0.30
    1.4529 0.02 0.50 1.0 0.010 19.0/21/0 24.0/26.0 6.0/7.0 0.030 0.15/0.25
    Note
    Nitrogen contents of grades 1.4301 and 1.4436 may be increased to 0.22% max

    BS 6744 tensile property table

    Grade
    Tensile Properties (min unless stated)
    - 0.2% Proof strength, Rp0.2 Stress Ratio, Rm/Rp0.2 Elongation at fracture, A5 Total elongation at maximum force, Agt
     
    200 200 1.10 22 5
    500 500 1.10 14 5
    650 650 1.10 14 5
    Note
    Proof strength and stress ratio units are MPa (N/mm2)
    Elongation values are percentages (%) (Elongation is A5, total is Agt)

    The Mechanical Properties of Stainless Steel

    Stainless steel is primarily utilised on account of its corrosion resistance. However, the scope of excellent mechanical properties offered by the various classifications and grades within the family of stainless steel render it extremely versatile.

    Throughout this article nominal or typical values will be used to illustrate the different properties being discussed and will be referred to as nominal values.

    The nominal values are those that are the norm for the various properties, but it is stressed that these must not be regarded as minimum, nor for some properties maximum, values for specification purposes.

    The nominal values inevitably vary, depending on the reference or source of the publication. E.g. grade 304 hot rolled and annealed plate at room temperature.

    As may be seen from this example, it is usually the case that the specified values are of a lower (or more conservative) value than the nominal values.

    Therefore, if guaranteed values are required, reference must be made to the actual specification.

    Different specifications stipulate different values and this can lead to either less or more cost-effective utilization of stainless steel material, a factor that is of importance when considering the higher price of stainless steel relative to other materials of construction.

    MECHANICAL PROPERTIES

    The mechanical properties are a measure of the metal’s response to an applied force. Several properties are used to define material properties and are detailed on test certificates supplied:

    • Yield and tensile strength
    • Ductility
    • Hardness

    Additional properties are:

    • Toughness
    • Creep resistance
    • Fatigue resistance

    YIELD AND TENSILE STRENGTH

    The most common mechanical property used for comparison, reference and design purposes is that of strength – both the yield strength and the tensile strength.

    To determine both these strengths, standard test specimens, which are schematically shown in Figure 1, are machined from the material and then
    subjected to an increasing measured load in tension until rupture occurs.

    As the increasing tensile load is applied, a diagram (graph) is plotted to show the progressive relationship between the stress and strain. The
    stress-strain curve is typified by various regions. Refer to Figure 2.

    From O to E the strain produced is elastic. On removal of the stress the specimen (or the material in actual use) will revert to its original dimensions.
    The stress value corresponding to E is termed the elastic limit.

    As the stress is raised above the elastic limit (E), the material will start to deform in a plastic manner and the material undergoes permanent deformation and increased dimensions.

    Mild steel shows a pronounced yield point, as indicated in Figure 3 At the yield point the material shows a sudden increase of strain for no
    increase in stress. For such steel this is reported as the yield strength or the yield stress.

    Stainless steel does not typically show this clear yield point and the change from elastic behaviour to permanent plastic deformation is not usually easy to detect.

    This has led to the design strength of stainless steel being reported using a different factor, which may cause confusion. In the initial stages of plastic deformation, only a small amount of permanent strain occurs for relatively large increases in stress.

    Therefore the yield strength of stainless steel is usually taken as the stress that will produce a 0.2% permanent strain (offset).

    Referring to Figure 2, this is obtained by a line drawn parallel to OE from 0.2% strain to intersect the curve at Y. The stress value corresponding to Y is taken as the yield strength.

    The yield strength for stainless steel is therefore reported as the 0.2% proof stress (RP0.2).

    • With further tensile loading permanent strain continues, as indicated by the curve between Y and T in Figure 2 and reaches a maximum at T.
      The stress corresponding to T, reported as the tensile strength. This value is also sometimes termed the ultimate strength or the ultimate tensile strength (UTS).
    • After this the plastic deformation becomes localised and rapid decrease of the cross-sectional area occurs, known as necking.
    • The final fracture (breakage) of the specimen occurs at F.

    ELONGATION AND REDUCTION OF AREA (RA)

    During the determination of the yield and tensile strengths, the mechanical properties of elongation and/or reduction of area (RA) are also determined.

    ELONGATION is determined as follows: Before the tensile test specimens are subjected to the load, a standard length is marked on the reduced section of the test specimen. This is known as the Gauge (Gage) Length and is indicated by “G” in Figures 1(A) and 1(B).

    Different specifications lay down different gauge lengths, e.g. 50mm (2”), 200mm (8”) or sometimes as a formula:

    Gauge length – 5.65 √So (i.e. 5.65 x square root of the original cross-sectional area).
    This is known as proportional elongation and is designed to remove the effect that thickness has on elongation.

    After fracture the two pieces are carefully put together and the increased distance between the marks is taken.

    The Elongation is calculated by:

    and is thus reported as a percentage, with the gauge length specified. E.g. Elongation in 50 mm = 28%.

    REDUCTION OF AREA (RA) is determined as follows: After fracture the two pieces of the specimen are carefully fitted together and
    the average diameter, or the width and thickness, of the smallest cross section to which the specimen has been reduced by necking is measured.

    The RA is calculated by:

    and is thus reported as a percentage. Eg. RA = 55%.

    Both Elongation and RA are a measure of the DUCTILITY of the material, i.e. the ability of the material to deform in a plastic manner without fracturing.

    Elongation is the property most often used in this respect. RA suffers from the drawback that even at relatively low levels of ductility the RA has values of  ±50%. As the ductility increases RA rapidly increases to high values ±70-75%, which renders it insensitive to a meaningful assessment of ductility.

    HARDNESS

    Hardness is an often a reported mechanical property and is useful as a means of giving an indication of the tensile strength and as a non-destructive test for checking heat treatment and the sorting of material.

    Hardness is determined by measuring the resistance of the material to penetration (indentation).

    • Brinell Test: A hardened steel ball indentor (10mm diameter) is forced into the material by a standard load. The diameter of the impression gives, from tables, the Brinell Hardness Number (BHN).
    • Rockwell Test: Either a hardened steel ball (Rockwell B – HRB) or a diamond brale (Rockwell C – HRC) is forced into the material by standard applied loads.
    • The depth of penetration is used to give a Rockwell number directly from the scale on the equipment. HRB is used for soft materials and HRC for hard materials.
    • Other hardness tests are also sometimes used, these include:
      Vickers Test: Vickers Pyramid Number (VPN), usually only used in the laboratory.
      Shore Test: Measures the rebound of a hardened ball up a standard tube.
      Used when no indentation can be tolerated.
      Some indicative comparisons (Relative basis of hardness)Very Hard 62HRC 688 BHN
      Hard 48 HRC 455 BHN
      Medium Hardness 30 HRC 286 BHN
      Soft 90HRB 185 BHN
      Very Soft 72 HRB 130 BHN

    TOUGHNESS

    Toughness is the capacity of a material to yield plastically under conditions of highly localised stress. It is an important engineering property.
    The test most often used is the Charpy V Notch Impact Test. Similar tests such as the Charpy Keyhole and Izod Test are also used
    Impact values are reported as the energy absorbed, with the type of test and the temperature noted. The units are joules (J).

    E.g. impact strength: Charpy V (20°C) = 60J.

    The values determined are qualitative comparisons and although often reported, or specified as acceptance criteria, they cannot be converted to energy values that can be utilized in engineering calculations.

    Impact testing can also be used to assess the effect of lower temperatures on a material. Impact specimens are uniformly heated or cooled to various
    temperatures and quickly tested before they lose or gain heat from the surroundings.

    A plot of the energy absorbed is made against the testing temperature of the specimens. The ductile to brittle transition temperature (DBTT) is taken
    at the temperature at which the slope of the curve changes. This is shown schematically in Figure 5.

    Most steel suffers from a loss of toughness as the temperature drops to freezing point (0°C) and below. The actual impact strength at the DBTT
    varies for different types of steel. As a general rule, if this value is less than about 35J, the material is described as brittle. This does not necessarily preclude the use of the material. However, it does indicate that the material must be used with caution. Applications that involve any impact loads or dynamic stress are very susceptible to the presence of defects or imperfections and are best avoided.

    Applications involving static or constant loads are generally acceptable. Some steels exhibit impact strengths in excess of 35J at the DBTT and even at lower temperatures and therefore are considered tough at all temperatures.

    MECHANICAL PROPERTIES OF DIFFERENT STAINLESS STEEL TYPES

    The various different types of stainless steel exhibit distinctly different ranges of mechanical properties:

    AUSTENITIC STAINLESS STEEL
    YIELD STRENGTH AND TENSILE STRENGTH

    Nominal room temperature yield strengths (0.2% offset) and tensile strengths for some annealed austenitic stainless steel are given in Table 1.

    • Austenitic stainless steels show a marked response to cold working, which significantly increases both the yield and tensile strengths. The degree to which work-hardening affects the strength levels depends on the chemical composition of the different steels, particularly with regard to the content of the elements that stabilise the austenitic crystal structure, especially nickel.

    ELEVATED TEMPERATURE PROPERTIES

    Austenitic stainless steel shows excellent properties at elevated temperatures. Elevated temperature properties are reported in two different ways: long and short time properties.

    Short Time Properties

    The tensile test specimen is heated to the required temperature of the test and actually tested at this temperature to obtain the stress-strain curve and the resultant yield and tensile strengths.

    The effect of elevated and high temperatures on both the yield and tensile strengths in MPa, is taken on a short time basis, as indicated in Table 2.
    In general terms it may be seen that the L grades suffer a greater loss of properties with a rise in temperature, particularly with regard to their tensile
    strengths.

    Long Time Properties

    At high temperatures (in excess of about 500ºC) the strain is dependent on the applied stress and time.

    The metal undergoes a continuous slow deformation, which is termed creep. Creep can occur at stresses below the short time yield strength.

    Long time strength properties are generally expressed in two ways: –

    • The Creep Stress is that which will cause a specific rate of deformation in a given time (i.e. within the secondary creep range) at a specific temperature.
    • The Rupture Stress is that which will cause rupture (i.e. encompasses all stages of creep) in a given time and at a specific temperature.

    DUCTILITY

    Annealed austenitic stainless steel has excellent elongation values of typically 50-60% and higher.

    They therefore possess a superior ability to be cold formed, pressed, drawn and spun into deep shapes. Cold working does bring about a decrease in the ductility. Elongation of ± 20% are typical for material which has undergone 30% cold work – still a very acceptable ductility by normal Engineering standards.

    At sub-zero temperatures the Elongation decreases only slightly, giving a typical elongation value of 40-50%.

    HARDNESS

    In the annealed condition typical hardness is 150-160 HBN. Small amounts of cold work can rapidly increase the hardness up to levels of ± 250 HBN. Further cold work results in a slower increase in hardness. Spring temper wires and grade 301 cold rolled to full hard temper have hardnesses  in the order of 340-380 HBN.

    TOUGHNESS

    Annealed austenitic stainless steel has excellent toughness, with Charpy V (room temperature) typically in excess of 165J. Charpy V values at sub-zero temperatures do decrease, but even at temperatures as low as 196°C below zero they are typically between 90J and 120J, i.e. not approaching values that are considered as brittle.

    From the above it may be seen that austenitic stainless steel has exceedingly good low temperature mechanical properties. It is for this reason that they are used virtually exclusively for the manufacture of vessels to contain liquid gases at cryogenic temperatures.

    FATIGUE

    If metals are subject to repeated fluctuating (reversing) loads at stresses below the tensile strength, a fatigue crack can initiate in the material, which then with increasing cycles of loading propagates until final failure by fracture occurs. The resistance to fatigue at various stress levels is therefore required for many engineering applications.

    FERRITIC STAINLESS STEEL

    YIELD STRENGTH AND TENSILE STRENGTH

    Nominal room temperature yield strengths (0.2% offset) and tensile strengths for annealed ferritic stainless steel is given in Table 3.

    • Ferritic stainless steel has useful elevated temperature strengths, but these strengths tend to fall off rapidly at high temperatures so ferritics are seldom used at high temperatures, except for their oxidation resistance.

    FATIGUE

    Nominal Fatigue strengths for ferritic stainless steel is between 310-330 MPa.

    DUCTILITY

    Ferritic stainless steel has nominal elongation values as indicated below:
    409 = 22%
    430 = 25%
    18-2 super ferritic = 30%
    3CR12 = 22%

    They therefore have a ductility equivalent to carbon mild steel and are suitable for cold forming operations of a moderate degree.

    HARDNESS

    Ferritic stainless steel in the annealed condition has a nominal hardness of 165 HBN. It is non-hardenable, either by heat treatment nor by cold work.

    TOUGHNESS

    The impact strengths of ferritics varies significantly according to the chemical composition, particularly with respect to the ductile to brittle transition temperature (DBTT).

    Standard ferritic stainless steel is tough at room temperature and in general its DBTT is between 20°C and 0°C. Thus below 0°C, the steel would
    be considered to have a low toughness.

    Super ferritic stainless steel and 3CR12, with specially controlled chemical compositions, particularly with respect to specified low levels of both carbon and nitrogen, have a DBTT below freezing point. In general ferritic stainless steel is not suitable for use at low temperatures.

    Note: It is stressed that welding has a marked effect on the toughness of standard ferritics within the weld zone, due to changes to the crystal structure brought about in the heat affected zone (HAZ).

    MARTENSITIC STAINLESS STEEL

    Martensitic stainless steel is usually supplied in the annealed condition for ease of machining. As such it has mechanical properties similar to ferritic stainless steel, because in this condition it possesses a ferritic structure. To develop attainable mechanical properties (and corrosion resistance) it requires heat treatment by quenching and tempering, (also sometimes referred to as hardening and stress relieving). This involves:-

    • Heating the steel to within a specified high temperature range for sufficient time to ensure the uniform attainment of this temperature throughout the cross-section.
    • Rapidly cooling (quenching) the steel from this high temperature, usually in oil.
    • Immediately tempering the quenched steel by re-heating to a temperature necessary to produce the desired combination of strength, hardness, ductility and toughness

    Nominal values for the yield strength (0.2% offset), tensile strength, elongation, hardness and toughness for some quenched and tempered martensitics is given in Table 4.

    The fatigue properties of martensitic stainless steel may be correlated to the quenched and tempered tensile strength level. As a nominal value,
    the fatigue limit may be taken as approximately 45% of the tensile strength. At such high levels, fatigue performance is adversely lowered by the presence of any surface imperfections or defects.

    Quenched and tempered martensitic stainless steel shows a marked drop in toughness as the temperature is lowered to 0°C and below.

    DUPLEX STAINLESS STEEL

    Duplex stainless steel has a combination of both austenitic and ferritic microstructures, so its properties share some of the characteristics of both types.

    However the presence of nitrogen in most of the grades generates very high proof and tensile strengths, while maintaining acceptable levels of ductility and toughness. Typical mechanical properties are shown in Table 5.

    Due to the formation of intermetallic phases at elevated temperatures, duplex grades are not usable above about 300°C. Duplex stainless steel has adequate ductility and toughness even at sub-zero temperatures to make it a versatile engineering product.

    CONCLUSION

    The mechanical properties of the four main classifications of the family of stainless steel have been covered in a general manner.

    How they are measured and the factors that govern and influence their values are similar for the other classifications of stainless steel and, in fact, for steel in general.

    The range of attainable values for the different mechanical properties is vast and this is more so for austenitic stainless steel. This factor is one of many that renders stainless steel an extremely versatile material

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    Stainless Steel Pipes Specifications

    ASTM A312: Seamless and straight-seam welded austenitic pipe intended for high temperature and general corrosive service. Filler metal not permitted during welding.

    ASTM A358: Electric fusion welded austenitic pipe for corrosive and/or high temperature service. Typically only pipe up to 8 inch is produced to this specification. Addition of filler metal is permitted during welding.

    ASTM A790: Seamless and straight-seam welded ferritic/austenitic (duplex) pipe intended for general corrosive service, with a particular emphasis on resistance to stress corrosion cracking.

    ASTM A409: Straight-seam or spiral-seam electric fusion welded large diameter austenitic light-wall pipe in sizes 14” to 30” with walls Sch5S and Sch 10S for corrosive and/or high

    ASTM A376: Seamless austenitic pipe for high temperature applications.

    ASTM A813: Single-seam, single- or double- welded austenitic pipe for high temperature and general corrosive applications.

    ASTM A814: Cold-worked welded austenitic pipe for high temperature and general corrosive service.

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    ASTM A312 Stainless Steel Pipe Price List in India


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