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gracias pero no es para tanto, es un poco chapucilla, pero la intencion es lo que cuenta.
A ver suso, la pagina actualmente dice que usa 904, y los tecnicos por las conversaciones que yo tuve en su dia, me da que no tienen n.p.i. solo saben que lleva un acero inox. que esta estudiado... vamos n.p.i. y si la pagina oficial lo dice, yo me lo creo, y punto.
Ya hablaremos tu y yo.
Corrosion Resistance
Although originally developed for its resistance to sulphuric acid it also has a very high resistance to a wide range of environments. A PRE of 35 indicates that the material has good resistance to warm sea water and other high chloride environments. High nickel content results in a much better resistance to stress corrosion cracking than the standard austenitic grades. Copper adds resistance to sulphuric and other reducing acids, particularly in the very aggressive "mid concentration" range.
In most environments 904L has a corrosion performance intermediate between the standard austenitic grade 316L and the very highly alloyed 6% molybdenum and similar "super austenitic" grades.
In aggressive nitric acid 904L has less resistance than molybdenum-free grades such as 304L and 310L.
For maximum stress corrosion cracking resistance in critical environments the steel should be solution treated after cold work.
Heat Resistance
Good resistance to oxidation, but like other highly alloyed grades suffers from structural instability (precipitation of brittle phases such as sigma) at elevated temperatures. 904L should not be used above about 400ºC.
Heat Treatment
Solution Treatment (Annealing) - heat to 1090-1175ºC and cool rapidly. This grade cannot be hardened by thermal treatment.
Welding
904L can be successfully welded by all standard methods. Care needs to be taken as this grade solidifies fully austenitic, so is susceptible to hot cracking, particularly in constrained weldments. No pre-heat should be used and in most cases post weld heat treatment is also not required. AS 1554.6 pre-qualifies Grade 904L rods and electrodes for welding of 904L.
Fabrication
904L is a high purity, low sulphur grade, and as such will not machine well. Despite this the grade can be machined using standard techniques.
Bending to a small radius is readily carried out. In most cases this is performed cold. Subsequent annealing is generally not required, although it should be considered if the fabrication is to be used in an environment where severe stress corrosion cracking conditions are anticipated.
Applications
Typical applications include:
· Processing plant for sulphuric, phosphoric and acetic acids
· Pulp and paper processing
· Components in gas scrubbing plants
· Seawater cooling equipment
· Oil refinery components
· Wires in electrostatic precipitators
Corrosion Resistance
Excellent in a range of atmospheric environments and many corrosive media - generally more resistant than 304. Subject to pitting and crevice corrosion in warm chloride environments, and to stress corrosion cracking above about 60ºC. Considered resistant to potable water with up to about 1000mg/L chlorides at ambient temperatures, reducing to about 500mg/L at 60ºC.
316 is usually regarded as the standard “marine grade stainless steel”, but it is not resistant to warm sea water. In many marine environments 316 does exhibit surface corrosion, usually visible as brown staining. This is particularly associated with crevices and rough surface finish.
Heat Resistance
Good oxidation resistance in intermittent service to 870ºC and in continuous service to 925ºC. Continuous use of 316 in the 425-860ºC range is not recommended if subsequent aqueous corrosion resistance is important. Grade 316L is more resistant to carbide precipitation and can be used in the above temperature range. Grade 316H has higher strength at elevated temperatures and is sometimes used for structural and pressure-containing applications at temperatures above about 500ºC.
Heat Treatment
Solution Treatment (Annealing) - Heat to 1010-1120ºC and cool rapidly. These grades cannot be hardened by thermal treatment.
Welding
Excellent weldability by all standard fusion and resistance methods, both with and without filler metals. Heavy welded sections in Grade 316 require post-weld annealing for maximum corrosion resistance. This is not required for 316L.
316L stainless steel is not generally weldable using oxyacetylene welding methods.
Machining
316L stainless steel tends to work harden if machined too quickly. For this reason low speeds and constant feed rates are recommended.
316L stainless steel is also easier to machine compared to 316 stainless steel due its lower carbon content.
Hot and Cold Working
316L stainless steel can be hot worked using most common hot working techniques. Optimal hot working temperatures should be in the range 1150-1260ºC, and certainly should not be less than 930ºC. Post work annealing should be carried out to induce maximum corrosion resistance.
Most common cold working operations such as shearing, drawing and stamping can be performed on 316L stainless steel. Post work annealing should be carried out to remove internal stresses.
Hardening and Work Hardening
316L stainless steel does not harden in response to heat treatments. It can be hardened by cold working, which can also result in increased strength.
Applications
Typical applications include:
· Food preparation equipment particularly in chloride environments.
· Pharmaceuticals
· Marine applications
· Architectural applications
· Medical implants, including pins, screws and orthopaedic implants like total hip and knee replacements
· Fasteners
Una cosa, para que coño va a indicar Rolex que fabrica sus cajas con 904 (cosa que yo tambien pensaba que paso a la historia por una conversacion que mantuve con el servicio oficial) si no lo hace, mas cuando la gente no tiene n.p.i. de 904, 316 etc.
En segundo lugar, es un acero de mas calidad para ambiente salino (es indicutiblemente mas resistente a este ataque que es el que interesa), esto no quiere decir que el 316 sea malo (todo lo contrario). Mecanizar una caja con acero 904 no implica ninguna complicacion, se ajustan los parametros de velocidad apropiados y listo.
Insisto, yo no pongo en duda lo que anuncia Rolexen su pagina web, y respecto al comentario de Jesud de que se tarda un año en fabricar un Rolex, yo supongo que el fabricar todas y cada una de las piezas que monta un Rolex en este caso u otro reloj similar, si es posible y probable que lleve del orden de 9000 horas de trabajo, desde un tornillo, una rueda dentada,etc. vas sumando y puede ser perfectamente cierto, es un modo de contar las cosas, aunque lleve a engaño.
Eso, eso. Y tardan un año en hacer un Rolex.
Si es que las páginas oficiales son las fuentes más fiables del mundo mundial
De hecho, el acero de Rolex lo fabrican con el acero de antiguas katanas, previamente testadas por el último descendiente del maestro Masamune la noche de luna llena posterior al florecimiento de una flor de loto en las faldas del monte Fuji. Y necesitan un año para hacer cada reloj porque el acero lo trae el mismo Shinosuke Masamune III desde Japón, en un hatillo de bambú cargado a la espalda.
Para que luego digan que son caros...
Por cierto, las poesías metafóricas son lo que son, imágenes que sugieren, no realidades...os que hilo muy fino???
Tú qué crees?
al PAM PAM ye l vino ...cogorza
Ten pués en cuenta las frase del (1º de España y 4º de Alemania):
“Definimos el horizonte dentro del cual tenemos que vivir” (Ortega).
Y definimos de forma real....y poética.
Saludos
"Rolex, algún pondrá en su divisa, CAJA:
"Fundida y torneada del acero tomado a los relojes enemigos, mejorado, limpio y pulido"
Saludos
Siempre aprendendo algo nuevo, gracias a todo por esta discusión interesantissima, que debria ser copiada a esenciales, tanto por lo que enseña sobre acero como sobre comportamiento en un foro! :ok¡
Buena divisa eh"Rolex, algún pondrá en su divisa, CAJA:
"Fundida y torneada del acero tomado a los relojes enemigos, mejorado, limpio y pulido"
Saludos
"La vida es breve y yo quiero vivir para siempre" dijo Yukio Mishima el día antes de realizar el sepuku. Cuando estudiaba me gustó mucho la biografía de este samurai del siglo XX. Primero por su completud en todos los ámbitos de su vida, físico y mental, como un filósofo griego y segundo por su sentido heideggeriano del estar-en-la-muerte.
Para leer El sol y el acero del Círculo de lectores
Un abrazo
surfista
No lo he leído. Así que tomo nota:ok¡Acabo de terminar de leer " El marino que perdió la gracia del mar " recientemente publicado en edición de bolsillo por Alianza Editorial y me ha encantado. No había leido nada de este autor y me ha enganchado. Aprovecharé que empieza la Feria del Libro de Madrid para comprar más obras de este autor. Merece la pena.