UNI Standards for Steel Materials

Sammanfattning:

In 1993, the Italian National Standards Institute (UNI) adopted the new International Classification for Standards (ICS) drawn up by ISO (International Organization for Standardization). In Italy UNI standards are produced by the Ente Nazionale Italiano di Unificazione. The prefix is UNI, which is followed by a four-digit product form code, and alphanumeric alloy identification similar to the DIN abbreviation system.

Metals standards are industry wide agreements as to how metals are defined. In this definition there may be information about the chemical composition, process of manufacture, heat treatment and many other pieces of hidden knowledge. The standard usually attempts to codify all of the various attributes into a simple to read letter/number designation. The ultimate utility of these standards is communication. Engineers, machinists, purchasing agents, and suppliers can all speak the same language of steel, aluminum, and copper and be assured of a consistent product.

A designation is the specific identification of each grade, type, or class of steel by a number, letter, symbol, name, or suitable combination. Unique to a particular steel grade, type and class are terms used to classify steel products. Within the steel industry, they have very specific uses: grade is used to denote chemical composition; type is used to indicate deoxidation practice; and class is used to describe some other attribute, such as strength level or surface smoothness.

Since 1988 a new series of 'mandatory' European standards (EN = Europaischen Normen) has been created, to replace national standards, such as BS, DIN, SS and NF, throughout 18 countries of Western Europe.

EN is a part of the 'Single Market' legislation, designed to give equal opportunities for firms to compete throughout Europe, by harmonising the technical requirements between countries. The national standards bodies, of which BSI is one, are required to officially withdraw their national standards, when an EN is created with the same scope of application.

In 1993, the Italian National Standards Institute (UNI) adopted the new International Classification for Standards (ICS) drawn up by ISO (International Organization for Standardization). In Italy UNI standards are produced by the Ente Nazionale Italiano di Unificazione. The prefix is UNI, which is followed by a four-digit product form code, and alphanumeric alloy identification similar to the DIN abbreviation system.

Many Italian UNI Standards, as well as some other European and International Standards have been adopted as Italian UNI EN and consequently replaced old and existing UNI material designations.

Categorized by material group, below are a range of UNI standards with descriptions, along with the current status and replacement details accordingly:

  • Group of standards for Iron
  • Group of standards for structural and constructional steels
  • Group of standards for stainless steels
  • Group of standards for castings
  • Group of standards for Welding and Filler materials

Iron

Standard
Number
Last
version
Description Status/Remarks
UNI 4544 1991 Spheroidal graphite cast iron - classification Replaced by UNI ISO 1083:1991; /6/
UNI 5007 1991 Classification of grey cast iron Replaced by UNI ISO 185:1991; /6/
UNI 5330 1969 Unalloyed grey iron for sand castings for use in the automobile industry. Qualities, requirements and tests Withdrawn 2008; /5/
UNI 6047 1967 Defects in cast iron and steel. Terms and definitions /No materials/
UNI 7451 1984 Malleable iron sand castings. Deviations for dimensions without tolerance indication and machining allowances /No materials/
UNI 7737 1977 Austenitic cast iron for castings. Qualities, requirements and tests /20/
UNI 7856 1978 Pig iron. Definition, classification and qualities /67/
UNI 8336 1981 Pig iron. Technical requirements of delivery /No materials/
UNI 8337 1981 Pig iron. Sampling for chemical analysis Replaced by UNI EN ISO 14284:2004; /No materials/
UNI 8845 1986 Abrasion resistant white-cast-irons. Qualities, requirements and tests Replaced by UNI EN 12513:2004; /10/
UNI 6459 1969 Chemical analysis of ferrous materials. Determination of phosphorus in steel and iron. Alkalimetric method /No materials/
UNI 7068 1983 Unalloyed grey iron sand castings. Deviations in dimensions without tolerance indication and machining allowances /No materials/
UNI 7089 1972 Chemical analysis of ferrous materials. Determination of copper in steel and in iron. Electrolytic method with controlled potential /No materials/
UNI 7330 1974 Chemical analysis of ferrous materials. Determination of copper in steel and cast iron. Photometric method /No materials/
UNI 7331 1974 Chemical analysis of ferrous materials. Determination of chromium in steel and cast iron. Photometric method /No materials/
UNI 7332 1974 Chemical analysis of ferrous materials. Determination of tungsten in steel and cast iron. Spectrophotometric method with potassium thiocyanate /No materials/
UNI 7333 1974 Chemical analysis of ferrous materials. Determination of tin in steel and cast iron. Spectrophotometric method with phenylfluorone /No materials/
UNI 7601 1984 Spheroidal graphite iron sand castings. Deviations in dimensions without tolerance indication and machining allowances /No materials/
UNI 8348-1 1982 Spectral analysis of ferrous materials for determination of lanthanides (rare earths). Determination of cerium in steels and cast irons. Method by x-ray fluorescence spectrometry /No materials/
UNI 8569 1984 Cast iron brake-shoes for railway vehicles /No materials/

Structural and constructional steels

Standard
Number
Last
version
Description Status/Remarks
UNI 6102 1990 Alloy quality steel raw tyres for wheel sets of railway tractive units. Quality, requirements and tests /1/
UNI 3595 1977 Unalloyed quality steels for castings with magnetic properties. Qualities, requirements and tests /5/
UNI 3960 1974 Hot rolled finished steel products. Smooth flat bars for carriage and volute springs. Dimensions and tolerances Replaced by UNI EN 10092-1:2004; /No materials/
UNI 3961 1974 Hot rolled finished steel products. Rigget flat bars for carriage springs for rolling stock of railway, metropolitan railway and tramway. Dimensions and tolerances /No materials/
UNI 3992 1975 Hot rolled finished special alloyed steel products. Round bars for internal combustion engine valves Replaced by UNI EN 10090:2000; /6/
UNI 5106 1973 Hot rolled steel finished products. Round bars for the manufacture of files and rasps Withdrawn 2008; /No materials/
UNI 5866 1977 Cold rolled flat finished unalloyed steel products. Drawing or cold bending sheets and strip Replaced by UNI EN 10130:1992; /3/
UNI 5867 1978 Hot rolled flat finished unalloyed steel products. Drawing or cold bending sheets acd coils. Qualities, requirements and tests Replaced by UNI EN 10111:2000; /4/
UNI 5949 1967 Special unalloyed and alloyed steel seamless tubes. Tubes with law temperature impact test. Qualities, requirements and tests Replaced by UNI EN 10216-4:2002; /5/
UNI 5961 1984 Cold rolled flat finished unalloyed steel products. Strips and cut lengths for cold forming. Qualities, requirements and tests Replaced by UNI EN 10139:1999; /No materials/
UNI 6328 1992 Steel rails for railway lines. Qualities, requirements and tests /4/
UNI 6363 1984 Welded and seamless steel tubes for water mains Replaced by UNI EN 10224:2003; /3/
UNI 663 1968 Unalloyed steel seamless tubes. Plain end tubes for general purposes. Qualities, requirements and tests Replaced by UNI EN 10216-1:2002, /9/
UNI 6681 1984 Hot rolled flat finished unalloyed steel products. Strips for cold rolling. Qualities, requirements and tests /4/
UNI 6683 1984 Hot rolled flat finished unalloyed steel products. Strips for cold drawing or cold bending. Qualities, requirements and tests Replaced by UNI EN 10111:2000; /4/
UNI 7064 1982 Cold rolled flat finished products of special alloy and unalloyed steel. Strips for springs. Qualities, requirements and tests Replaced by UNI EN 10132-1:2002; UNI EN 10132-4:2002; /9/
UNI 7070 1982 Hot rolled finished products of unalloyed basic and quality steel. Sections, merchant bars, wide flats, plates, sheets, strips and coils for structural and engineering purposes Replaced by UNI EN 10025:1992; /40/
UNI 7806 1979 Unalloyed quality steel - Hot finished hollow sections of steel and special alloy steel for structural purposes Replaced by UNI EN 10210-1:1996/ /9/
UNI 7958 1979 Cold rolled flat finished products of unalloyed quality steel. Structural sheets and coils /3/
UNI 8373 1982 Hot rolled finished products of non- alloy quality steel for heat treatment. Bars and wire rod for mechanical purposes. Qualities, requirements and tests Replaced by UNI EN 10084:2000; /10/

Stainless Steel

Standard
Number
Last
version
Description Status/Remarks
UNI 6900 1971 Special alloyed, corrosion and heat resisting, stainless steel Replaced by UNI EN 10088-1:1997; /38/
UNI 3161 1983 Stainless, corrosion resisting steel sand castings. Qualities, requirements and tests Replaced by UNI EN 10213-4:1998; /19/
UNI 6904 1971 Seamless tubes of special alloyed, corrosion and heat resisting, stainless steels Replaced by UNI EN 10216-5:2005; /28/
UNI 8366 1982 Cold rolled flat finished products of corrosion and heat resisting stainless steel. Strips for springs Replaced by UNI EN 10259:1998; /4/
UNI 3159 1983 Stainless, heat resisting steel and alloy sand castings. Qualities, requirements and tests Replaced by UNI EN 10213-4:1998; /16/
UNI 6901 1971 Semi-finished products and hot-rolled or forged bars and rods of special alloyed stainless steel, resistant to corrosion and heat Replaced by UNI EN 10088-3:1997; /41/
UNI 6936 1971 Aircraft metallic materials. Austenitic stainless steel (C 0,07%, Cr 18% and Ni 9,5%) Withdrawn 1998; /1/
UNI 7500 1975 Hot and cold rolled flat finished alloyed austenitic stainless steel products. Plates and strips for boilers and pressure vessels Replaced by UNI EN 10028-7:2002; /18/
UNI 8029 1979 Aerospace metallic materials. Special austenitic alloyed stainless steel investment castings (C 0,06; Cr 18; Ni 10,5; Nb 10 C) /1/
UNI 8317 1981 Corrosion and heat resisting stainless steel plate, sheet, strip and coil Replaced by UNI EN 10088-2:1997; /38/
UNI 6937 1971 Aircraft metallic materials. Austenitic stainless steel (C 0,06%, Cr 18%, Ni 10,5% and Ti 5 C) Withdrawn 1998; /1/
UNI 6938 1971 Aircraft metallic materials. Austenitic stainless steel (C 0,12%, Cr 17% and Ni 7%) Withdrawn 1998; /1/
UNI 6939 1971 Aircraft metallic materials. Austenitic stainless steel (C 0,03%, Cr 18% and Ni 10,5%) Withdrawn 1998; /1/
UNI 6940 1971 Aircraft metallic materials. Austenitic stainless steel (C 0,10%, Cr 18% and Ni 9%) Withdrawn 1998; /1/
UNI 6941 1971 Aircraft metallic materials. Austenitic stainless steel (C 0,06%, Cr 18%, Ni 10,5% and Nb 10 C) Withdrawn 1998; /1/
UNI 6943 1971 Aircraft metallic materials. Martensitic controlled ferrite stainless steel (C 0,13%, Cr 12,25% and Ni 0,55%) Withdrawn 1998; /1/
UNI 7715 1977 Chemical analysis of ferrous materials. Determination of lead in stainless steels. Method by atomic absorption spectrophotometry in flame /No materials/
UNI 6403 1986 Seamless steel tubes, intended and not intended for heat treatment, for use in road vehicles and for specific purposes / 20 /

Castings

Standard
Number
Last
version
Description Status/Remarks
UNI 3157 1970 Steel sand casting. General technical requirements for delivery and inspection Replaced by UNI EN 1559-2:2002; /No materials/
UNI 3158 1977 Cast unalloyed quality steels for general engineering purposes. Qualities, requirements and tests Replaced by UNI EN 10293:2006; /4/
UNI 3160 1983 Special, wear-resisting steel sand castings. Qualities, requirements and tests /7/
UNI 3608 1983 Special steel sand castings, resistant to mechanical stresses at elevated temperatures. Qualities, requirements and tests Replaced by UNI EN 10213-2:1998; /8/
UNI 4010 1975 Unalloyed and alloyed high strength steels for castings. Qualities, requirements and tests Replaced by UNI EN 10213-2:1998; /6/
UNI 7316 1974 Steel for castings suitable for welded structural parts exposed to pressure. Qualities, requirements and tests Replaced by UNI EN 10213-2:1998; /7/
UNI 10800 1999 Copper and copper alloys - Ingots and castings - Special aluminium bronze (CuAl9Fe3Zn3Ni2) for remelting of mechanical articles with tight tolerances /1/
UNI 3044 1950 Primary copper-aluminium alloy for casting, (Cu 5%) Replaced by UNI EN 1706:1999; /2/
UNI 3046 1950 Primary nickel-magnesium-iron-copper- aluminium alloy for casting (Cu 3% - Fe 15% - Si 07% - Mg 06% - Ti 015%) Withdrawn 1998; /3/
UNI 7363 1979 Pressure die casting aluminium-silicon- copper-iron-zinc alloy (Si 12%, Cu 2%, Fe 0,9%, Zn) Replaced by UNI EN 1706:1999; /2/
UNI 7369-4 1974 Casting aluminium-silicon-copper secondary alloy (Si 6%, Cu 4%) Replaced by UNI EN 1706:1999; /2/
UNI 8024 1979 Casting aluminium alloys, Aluminium- silicon-magnesium-titanium alloy (Si 7%, Mg, Ti) Replaced by UNI EN 1706:1999; /2/
UNI 8705 1987 Pressure die casting primary magnesium- allumunium-manganese alloy (Al 6% - Mn 0,2%) /2/
UNI 9348 1989 Aluminium and aluminium alloys castings, Technical general conditions of delivery /No materials/
UNI 8768 1985 Primary steel products (ingots and products obtained by continuous casting) intended for forging and drop forging. Quality requirements for delivery /No materials/
UNI 3041 1950 Primary magnesium-iron-copper-aluminium alloy for casting (Cu 10% - Fe 1% - Mg 0.3%) Withdrawn 1998; /2/
UNI 3599 1989 Casting aluminium alloys, Aluminium- silicon-magnesium alloys (Si 7% - Mg 0,3%) Replaced by UNI EN 1706:1999; /No materials/
UNI 4855 1978 Cast copper alloys, General notions Replaced by UNI EN 1982:2000; /No materials/
UNI 5033 1962 Copper alloy ingots and castings, Binary brass with Cu 60 percent and Zn 40 percent Replaced by UNI EN 1982:2000; /1/
UNI 7013-10 1972 Cast copper alloys, Copper-tin alloy Cu 90% and Sn 10% Replaced by UNI EN 1982:2000; /2/

Welding and Filler materials

Standard
Number
Last
version
Description Status/Remarks
UNI 10363 1994 Titanium. Seamless and welded titanium and titanium alloy pipes for industrial uses /No materials/
UNI 10364 1994 Titanium. Seamless and welded titanium and titanium alloy tubes for condensers and heat exchangers /No materials/
UNI 10930 2001 Round non alloy and alloy special steel rod for production of core for coated electrodes and for filler metal per gas shielded arc welding and submerged au welding - Technical delivery conditions /33/
UNI 5462 1964 Weldless steel pipes. Pipes for boilers and for high-temperature, high-pressure heating systems. Requirements and tests Replaced by UNI EN 10216-2:2002; /5/
UNI 5771 1966 Not alloyed and alloyed steel rounds for chains with forge welded and electrical welded links. Quality, requirements and tests /5/
UNI 6363 1984 Welded and seamless steel tubes for water mains Replaced by UNI EN 10224:2003; /3/
UNI 6682 1987 Hot and cold rolled flat finished steel products. Plates, sheets and coils intended for production of welded tubes /No materials/
UNI 6927 1971 Aircraft metallic materials. Hardening and tempering alloyed steel, weldable (C 0,15%, Cr 1,40%, Mo 0,90% and V 0,25%) Withdrawn 1998; /1/
UNI 6928 1971 Aircraft metallic materials. Hardening and tempering alloyed steel weldable (C 0,25%, Cr 1,0%, and Mo 0,20%) Withdrawn 1998; /1/
UNI 6929 1971 Aircraft metallic materials. Hardening and tempering alloyed steel, weldable (C 0,35%, Cr 1,0% and Mo 0,20%) Withdrawn 1998; /1/
UNI 6930 1971 Aircraft metallic materials. Hardening and tempering low alloyed steel, weldable (C 0,21% and Mn 1,50%) Withdrawn 1998; /1/
UNI 7091 1972 Unalloyed steel welded pipes. Smooth pipes for general uses Replaced by UNI EN 10217-1:2002; /4/
UNI 7316 1974 Steel for castings suitable for welded structural parts exposed to pressure. Qualities, requirements and tests Replaced by UNI EN 10213-2:1998; /7/
UNI 7683 1977 Threaded tubes and fittings for cable conduits for explosion proof electrical installations. Unalloyed steel seamless and welded tubes, galvanized /1/
UNI 7732 1978 Hot forged finished steel products. Forged rolled and welded rings. Tolerances and machining allowances /No materials/
UNI 7946 1979 Plain end welded precision steel tubes Replaced by UNI EN 10305-2:2003; /5/
UNI 7947 1979 Plain end welded and sized precision steel tubes Replaced by UNI EN 10305-3:2003; /5/
UNI 8863 1987 Unalloyed steel seamless and welded tubes suitable for screwing in accordance with UNI ISO 7/1 Replaced by UNI EN 10255:2005; /1/
UNI 8913 1987 Welded steel tubes in road vehicles Replaced by UNI EN 10296-1:2003; /7/
UNI 8927 1986 Electrically welded steel fabrics and lattice girders for the reinforcement of concrete /No materials/

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