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engineering and metallurgy, hot hardness or red hardness (when a metal glows a dull red from the heat) corresponds to hardness of a material at high temperatures
Hot_hardness
Measure of a material's resistance to localized plastic deformation
In materials science, hardness (antonym: softness) is a measure of the resistance to localized plastic deformation, such as an indentation (over an area)
Hardness
Materials used in cutting tools
The following properties are required for cutting tool materials: hardness, hot hardness and pressure resistance bending strength and toughness inner bonding
Cutting_tool_material
Materials well-suited to be made into tools
high-speed, hot-work, and special-purpose. The choice of group to select depends on cost, working temperature, required surface hardness, strength, shock
Tool_steel
American martensitic stainless steel
steel some secondary hardening and hot hardness. Both were central to its intended use in bearings. At comparable hardness, 154CM resists pitting better than
154CM
Water that has a high mineral content
needed]. It can pose critical problems in industrial settings, where water hardness is monitored to prevent limescaling in boilers, cooling towers, and other
Hard_water
Steel alloyed with a variety of elements
variously improve strength, hardness, toughness, wear resistance, corrosion resistance, hardenability, and hot hardness. To achieve these improved properties
Alloy_steel
Large tub for hydrotherapy or pleasure
foaming. The ideal range of calcium hardness in hot tub water should be between 150 and 250 ppm. Portable vinyl-liner hot tub: these are cheaper and smaller
Hot_tub
Soft calcium sulfate mineral
[citation needed] The Mohs scale of mineral hardness defines gypsum as hardness value 2 based on scratch hardness comparison. Fine-grained white or lightly
Gypsum
Compound of silicon and nitrogen
to its hardness, thermal stability, and resistance to wear. It is especially recommended for high speed machining of cast iron. Hot hardness, fracture
Silicon_nitride
1977 studio album by Slave
The Hardness of the World is the second album by the American funk band Slave, released in 1977, their second album release that year. The lead single
The_Hardness_of_the_World
American company which develops and manufactures specialty steels
first steel mill to use hot and cold rolling of stainless and high-alloy sheet and strip. Iron Age, manufacturer of the hot reversing mill, called this
Crucible_Industries
Process of heat treating used to increase the toughness of iron-based alloys
iron, to achieve greater toughness by decreasing the hardness of the alloy. The reduction in hardness is usually accompanied by an increase in ductility
Tempering_(metallurgy)
Form of thermoplastic adhesive
Hot-melt adhesive (HMA), also known as hot glue, is a form of thermoplastic adhesive that is commonly sold as solid cylindrical sticks of various diameters
Hot-melt_adhesive
Calcium carbonate mineral
component of limestone. Calcite defines hardness 3 on the Mohs scale of mineral hardness, based on scratch hardness comparison. Large calcite crystals are
Calcite
Complex oxide molecules that contain five or more metal ions
Tsing-Shien; Yeh, Jien-Wei; Chen, Swe-Kai (2011-04-25). "On the superior hot hardness and softening resistance of AlCoCrxFeMo0.5Ni high-entropy alloys". Materials
High_entropy_oxide
Oxide mineral
(ruby-sapphire) (appearing in Sanskrit as kuruvinda). Because of corundum's hardness (pure corundum is defined to have 9.0 on the Mohs scale), it can scratch
Corundum
Subset of tool steels
steels can withstand higher temperatures without losing their temper (hardness), allowing use of faster cutting speeds. At room temperature, in their
High-speed_steel
Type of armour
The typical Brinell Hardness range of MIL-A 12560 is 302-400 The MIL-12560K standard actually specifies four classes of hardnesses. The softest class I
Rolled_homogeneous_armour
Resistance against ionizing radiation of electronics
radiation-hardened versions (RadHard). While SOI eliminates latchup events, TID and SEE hardness are not guaranteed to be improved. Choosing a substrate with wide band
Radiation_hardening
Form of carbon
it at a negligible rate under those conditions. Diamond has the highest hardness and thermal conductivity of any natural material, properties that are used
Diamond
Technique used in heat treating
harden or soften certain areas of an object, creating a difference in hardness between these areas. There are many techniques for creating a difference
Differential_heat_treatment
Red mercury(II) sulfide mineral, HgS
alkaline hot springs. The mineral resembles quartz in symmetry and it exhibits birefringence. Cinnabar has a mean refractive index near 3.2, a hardness between
Cinnabar
Multinational steel producer
combine high material hardness with wear resistance. The Granshot process was developed at Uddeholm. In the Granshot process, hot liquid molten metal is
Uddeholms_AB
Steel in which the main interstitial alloying constituent is carbon
suitable for welding, but can be heat treated to improve its strength, hardness, and durability. Carbon steel is susceptible to rust and corrosion, especially
Carbon_steel
Process of heating something to alter it
hardness either a range should be given or the minimum hardness specified. If a range is specified at least 5 points should be given. Only hardness is
Heat_treating
Metal casting process
strength-to-weight ratio; lightest alloy commonly die cast. Copper: high hardness; high corrosion resistance; highest mechanical properties of alloys die
Die_casting
Variety of chalcedony with fire-like flashes
have beautiful iridescent rainbow colors, similar to opal. They have a hardness of 6.5-7 on the Mohs scale, which reduces the occurrence of scratching
Fire_agate
Bird embryo eaten from egg shell
the embryo and the egg white itself. Added salt can also increase the hardness of the egg yolk and affect the overall texture of the final balut product
Balut_(food)
Any metal shaping process occurring above its recrystallization temperature
materials from strain hardening, which ultimately keeps the yield strength and hardness low and ductility high. This contrasts with cold working. Many kinds of
Hot_working
Mineral form of calcium fluoride
isometric forms are not uncommon. The Mohs scale of mineral hardness, based on scratch hardness comparison, defines value 4 as fluorite. Pure fluorite is
Fluorite
Drug delivery form in which the ingredients are solidified for later consumption
The hardness of tablets is the principal measure of mechanical strength. Hardness is tested using a tablet hardness tester. The units for hardness have
Tablet_(pharmacy)
Iron-carbon alloy
bulk hardness of the cast iron simply by virtue of their own very high hardness and their substantial volume fraction, such that the bulk hardness can
Cast_iron
Heat treatment that alters the properties of a material
chemical properties of a material to increase its ductility and reduce its hardness, making it more workable. It involves heating a material above its recrystallization
Annealing_(materials_science)
Mixture or metallic solid solution composed of two or more elements
alloyed to improve their properties or behavior, such as increased strength, hardness or corrosion resistance. Metals may also be alloyed to reduce their overall
Alloy
Alloy steel containing around 13% manganese
times its surface hardness during conditions of impact, without any increase in brittleness which is usually associated with hardness. This allows mangalloy
Mangalloy
Type of heavy and hard wood
the Janka scale of hardness, which measures hardness of woods, lignum vitae ranks highest of the trade woods, with a Janka hardness of 4,390 lbf (19,500 N)
Lignum_vitae
Chemical element with atomic number 76 (Os)
electrical contacts, and other applications that require extreme durability and hardness. Its chemical applications are more prominent, with major applications
Osmium
Chemical element with atomic number 74 (W)
tungsten arc welding, superalloys, and radiation shielding. Tungsten's hardness and high density make it suitable for military applications in penetrating
Tungsten
maximum tensile elastic strain in excess of 9%. The anisotropy of diamond hardness is carefully considered during diamond cutting. Diamond has a high refractive
Material properties of diamond
Material_properties_of_diamond
Natural hot springs in Yukon, Canada
Takhini Hot Springs (Takhini Hotspring) (tɑːkiːniː) is a natural hot springs located just outside the border of Whitehorse, Yukon (28 km (17 mi) from the
Takhini_Hot_Springs
Depth to which a metal is hardened after being submitted to a thermal treatment
putting it through a heat treatment process. It should not be confused with hardness, which is a measure of a sample's resistance to indentation or scratching
Hardenability
Diamond created by controlled processes
diamonds depend on the manufacturing process. Some have properties such as hardness, thermal conductivity and electron mobility that are superior to those
Synthetic_diamond
Variety of beryl
hematite, saltwater, biotite, rutile or pyrite. Its hardness on the Mohs scale of mineral hardness is rated as 7.5-8. This rating gives aquamarine the
Aquamarine_(gem)
Extremely hard ceramic compound
sabotage powders, as well as numerous industrial applications. With a Vickers hardness of >30 GPa, it is one of the hardest known materials, behind cubic boron
Boron_carbide
Inorganic, nonmetallic solid prepared by the action of heat
ceramics' greater hardness. In the early 1980s Toyota researched production of an adiabatic engine using ceramic components in the hot gas area. The use
Ceramic
Maximum stress withstood by stretched material before breaking
strain rate selected for the test. When testing some metals, indentation hardness correlates linearly with tensile strength. This important relation permits
Ultimate_tensile_strength
Chemical compound
reduces its hardness. By definition, a hardness value exceeding 40 GPa makes BAM a superhard material. In the BAM−TiB2 composite, the maximum hardness and toughness
Aluminium_magnesium_boride
Type of aluminium-zinc alloy
overaging past peak hardness (T6 temper) to near the T7 temper. A subsequent reaging at 120 °C for 24 hours returns the hardness and strength to or very
7075_aluminium_alloy
Chemical compound
a range of outstanding physical and chemical properties such as great hardness (close to that of rhenium diboride and boron nitride), low mass density
Boron_suboxide
Tool steel grade
experimental validation of micro-milling cutting forces of AISI H13 steel at hardness between 35 and 60 HRC". The International Journal of Advanced Manufacturing
Tool_steel_1.2344
Metal alloys used in traditional typefounding and hot metal typesetting
characteristics required for a type metal, but on its own it lacks the necessary hardness and does not make castings with sharp details because molten lead shrinks
Type_metal
Alloys with high proportions of several metals
Al1.3 film reached a maximum hardness of 8.74 GPa. As a result, the structural transition from FCC to BCC led to hardness enhancements with the increasing
High-entropy_alloy
Mineral made of silicon and oxygen
defining the value of 7 on the Mohs scale of hardness, a qualitative scratch method for determining the hardness of a material. The word quartz is derived
Quartz
Wear resistant cobalt-chromium alloys
to Stellite alloys which has been hot-rolled and hardened in a particular manner, to provide a combination of hardness, wear resistance and machinability
Stellite
Aluminum alloys containing magnesium and silicon
in two different ways through aHeat treatment can be hardened, whereby hardness and Strength rise, while ductility and Elongation at break. Both begin
Aluminium–magnesium–silicon alloys
Aluminium–magnesium–silicon_alloys
Tropical fruit
pink ("red" guavas). The seeds in the central pulp vary in number and hardness, depending on species. In 2024, world production of guavas was 62 million
Guava
Red-orange chalcedony variety
imprinting a seal with wax on correspondence or other important documents, as hot wax does not stick to carnelian. Sard was used for Assyrian cylinder seals
Carnelian
Chemical element with atomic number 5 (B)
boron nitride, among other applications, is used as an abrasive, as its hardness is comparable with that of diamond. Hexagonal boron nitride (h-BN) is the
Boron
Device that measures electric current
original on 2013-10-29. Retrieved 2013-07-10. Permanent magnet radiation hardness tests at the 100 MeV Linac: Preliminary results (PDF). SLAC (Report). Stanford
Ammeter
Thermoplastic polymer
acrylonitrile also contributes chemical resistance, fatigue resistance, hardness, and rigidity, while increasing the heat deflection temperature. The styrene
Acrylonitrile butadiene styrene
Acrylonitrile_butadiene_styrene
Transparent variety of gypsum
distinguishing characteristics of crystalline gypsum are its softness (hardness 2 on Mohs scale, soft enough to scratch with a fingernail) and its three
Selenite_(gypsum)
Kitchen appliance
via a timer, or by limiting the water quantity. In the latter case, the hardness of the egg is determined by the amount of water added. When the water has
Egg_boiler
Gem variety of the mineral corundum
and varies among gemological and trade conventions. Sapphire has a Mohs hardness of 9, making it highly resistant to scratching and abrasion. Natural sapphires
Sapphire
Topics referred to by the same term
HBW may refer to: Brinell scale, measuring indentation hardness Handbook of the Birds of the World Hawaiian baby woodrose (Argyreia nervosa), a perennial
HBW
Zeolite mineral
rarely pink and blue masses. Well-formed crystals are rare. It has a Mohs hardness of 6.5 and a specific gravity of 2.9, with a brittle fracture and no cleavage
Pollucite
only as a shaping tool, but also as a tempering tool, so that the final hardness of the formed tube after forming and cooling is increased. The process
Hot_metal_gas_forming
Chemical compound
insoluble in water and hydrochloric acid. It is extremely hard, with a Mohs hardness of 9.5. It has a low work function and one of the highest electron emissivities
Lanthanum_hexaboride
Microcrystalline or cryptocrystalline form of silica
were found in recent years at Tillya-tepe in north-western Afghanistan. Hot wax would not stick to it so it was often used to make seal impressions.
Chalcedony
Type of steel used in Middle Eastern swordmaking
performing tensile testing as well as hardness testing. They found that the Damascus steel was somewhat comparable to hot-rolled steel bars with 1.0 wt% carbon
Damascus_steel
Type of glass
wall): 0.97 ± 0.01 Thermal conductivity: 0.7–1.3 W/(m·K) Hardness (Mohs scale): 6 Knoop hardness: 585 kg/mm2 + 20[citation needed] Glass batch calculation
Soda–lime_glass
Method of drilling through ice
Experienced snow surveyors can use an ordinary ski pole to test snow hardness by pushing it into the snow; the results are recorded based on the change
Ice_drilling
Tabular arrangement of the chemical elements
"Should negative electron affinities be used for evaluating the chemical hardness?". Physical Chemistry Chemical Physics. 13 (6): 2285–2293. doi:10.1039/C0CP01785J
Periodic_table
Steel alloy known in Russia from medieval times
and carbon. Cementite is very hard and brittle; its hardness is about 640 by the Brinell hardness test, whereas ferrite is only 200. The amount of the
Bulat_steel
Art or decoration made from burn marks
or even paper. Woods differ in hardness, grain, figure, texture, color, and other physical characteristics. Hardness: All woods can be classified into
Pyrography
Technique of electroplating
provide corrosion resistance, facilitate cleaning, and increase surface hardness. Sometimes a less expensive substitute for chrome, such as nickel, may
Chrome_plating
Process of hardening the surface of a metal object
steels whose hardness relies on carbon content alone. Alloy steels containing nickel, chromium, or molybdenum can have very high hardness, strength, or
Case-hardening
British TV series
Cucumber, Banana, and Tofu are all named after the same scale of erection hardness, with Banana symbolising the middle of the scale from the flaccid Tofu
Banana_(TV_series)
Piece of mineral crystal used to make jewelry
very hard with a hardness score of 8 to 10 on the Mohs scale. Other stones are classified by their color, translucency, and hardness. The traditional
Gemstone
surfaces between material pairs Hardness: Ability to withstand surface indentation and scratching (e.g. Brinell hardness number) Malleability: Ability of
List_of_materials_properties
Type of Japanese ice cream
the cup to eat it like an ice cream stick". Some people have tried pouring hot coffee over it to make an affogato, but according to reports, this did not
Shinkansen_too_hard_ice_cream
British and Australian singer (1948–2022)
Angeles Times offers a counterpoint on her career decline in the mid-1980s: "Hardness never was Newton-John's comfort zone, though, and the 1980s were a much
Olivia_Newton-John
Field of science that studies the physical and chemical behavior of metals
characterised by exhibiting properties such as superplasticity and high impact hardness. Archaeological and Tamil language literary evidence suggests that this
Metallurgy
Relationship between items in a set
ordered. For example, materials are totally preordered by hardness, while degrees of hardness are totally ordered. If two items are the same in rank it
Ranking
Chemical element with atomic number 78 (Pt)
Platinum is insoluble in hydrochloric and nitric acid, but dissolves in hot aqua regia (a mixture of nitric and hydrochloric acids), to form aqueous
Platinum
Wood from angiosperm trees
exceptions. In both groups there is an enormous variation in actual wood hardness, with the range in density in hardwoods completely including that of softwoods;
Hardwood
Hard, high-strength copper alloy
capacity for being hot-formed. C17200 beryllium copper alloy has strength and hardness similar to that of steel; Rockwell hardness properties in its peak
Beryllium_copper
Beer or cider mixed with lemonade
with a dash of lemonade on top, the latter of which reduces the lager's hardness. In France, Switzerland and parts of Italy, a mix of beer and soda (lemonade
Shandy
Water purified by condensing it from steam
40–80 mg/L optimum, and a total water hardness (adding magnesium and calcium) of 2–4 mmol/L. At water hardness above 5 mmol/L, higher incidence of gallstones
Distilled_water
Process of hardening rubber
has good adhesion, elasticity, and durability characteristics. The Shore hardness can be varied between 18 and 60. Elongation at break can range from 150%
Vulcanization
Chemical element with atomic number 22 (Ti)
refractory solid exhibiting extreme hardness, thermal/electrical conductivity, and a high melting point. TiN has a hardness equivalent to sapphire and carborundum
Titanium
Cultural forging process for bladed weapons
layers of differing hardness. During quenching, the high carbon layers achieve greater hardness than the medium carbon layers. The hardness of the high carbon
Japanese_swordsmithing
Knife with a blade made out of non-metallic material
designed blade made through an additional hot isostatic pressing step, which increases toughness. The hardness of the ceramic material makes it difficult
Ceramic_knife
Chemical compound of hydrogen and oxygen
but also the preservation and shelf life of food.[citation needed] Water hardness is also a critical factor in food processing and may be altered or treated
Water
Standard alloy numbering system for steel grades
hardenability is a major requirement. The chemical requirements are loosened but hardness values defined for various distances on a Jominy test. Stainless steels
SAE_steel_grades
Flaw which compromises a weld's structural integrity
joint. Hardness of weld metal and heat affected zone (HAZ): Hardness is correlated with the brittleness of the material. To reduce excessive hardness, preheating
Welding_defect
Opaque, blue-to-green mineral
soluble in hot hydrochloric acid. Its streak is white to greenish to blue, and its fracture is smooth to conchoidal. Despite its low hardness relative to
Turquoise
Hydrated amorphous form of silica
Muller's glass; geyserite, also called siliceous sinter, deposited around hot springs or geysers; and diatomaceous earth, the accumulations of diatom shells
Opal
Tropical evergreen tree with edible fruit
fruit might spoil without any obvious external indications. Using the hardness of the rind as an indicator of freshness for the first two weeks following
Mangosteen
1977 studio album by Slave
Its lead single, "Slide", made it to number 32 on the Billboard Hot 100, topped the US Hot R&B/Hip-Hop Songs chart, and also reached number 58 in Canadian
Slave_(Slave_album)
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