302HQ Roostevaba teras

Mis on roostevaba teras 302HQ？

Klass 302HQ on spetsialiseeritud traat, mida kasutatakse väga laialdaselt roostevabast terasest valmistamiseks.

kinnitusdetailid. 3% vase lisamine koostisesse vähendab külmtöötlemise kõvenemise kiirust.

oluliselt võrreldes klassi 304-ga. 302HQ on standardne isekeermestavate kruvide valmistamiseks.

ja kerged masinakruvid; seda kasutatakse ka mõnede poltide, kruvide, neetide ja spetsiaalsete kruvide jaoks.

kinnitusdetailid. See on nüüdseks täielikult asendanud klassid 384 ja 305 külmtöötlemisel, vask

mis on nende kõrge niklisisalduse tõttu odavam alternatiiv.

Nimetus 302HQ ei ole standardiseeritud - ASTMi spetsifikatsioonides on see klass loetletud kui UNS S30430,

ja sama klassi alternatiivsed nimetused on “XM-7”, “304Cu” ja “304HQ”. .

roostevabast terasest kinnitusdetailide standardspetsifikatsioon, ISO 3506, sisaldab 302HQ kui vastuvõetavat

A2-klassi kinnitusdetailide koostis; seda toodetakse tavaliselt tugevusklassides A2-70 ja A2-80.

302HQ roostevaba teras 1.4567 Valmis toodete vorm

• Spiraal - ribad
• Foolium: Ulbrichi roostevabast terasest traat - Profiil
• Ümmargune
• Tasane
• Ruut

Taotlused 302HQ roostevaba teras

• Toiduainete töötlemise seadmed
• Transpordi- ja ladustamisseadmed (nt õllepruulimine, piimatöötlemine, veinivalmistamine)
• Köögipingid, valamud, kraanikausid, seadmed ja aparaadid
• Arhitektuursed paneelid, piirded ja liistud
• Kemikaalimahutid, sealhulgas transpordimahutid
• Soojusvahetid
• Riidest või keevitatud ekraanid
• Keermestatud kinnitusdetailid
• Vedrud

Eklassi 302HQ ekvivalendid

Hinne	UNS nr	Vana Briti		Euronorm		Rootsi SS	Jaapani JIS
		BS	En	Ei	Nimi
302HQ	S30430	394S17	-	1.4567	X3CrNiCu18-9-4	-	SUS XM7

Composition ranges for 302HQ grade of stainless steel

Mehaanilised omadused 

Property	Value
Tensile Strength, min	515 MPa
Yield Strength (0.2% Proof), min	205 MPa
Elongation in 50 mm, min	40%
Hardness, max	201 HB

Füüsikalised omadused

Hinne	Density (kg/m3)	Elastic Modulus (GPa)	Mean Coefficient of Thermal Expansion (µm/m/°C)			Thermal Conductivity (W/m.K)		Specific Heat 0-100 °C (J/kg.K)	Electrical Resistivity (nΩ.m)
			0-100 °C	0-315 °C	0-538 °C	at 100 °C	at 500 °C
302HQ	8027	193	17.2	17.8	18.8	16.3	21.5	500	720

Korrosioonikindlus

Equal to or exceeding that of Grade 304. Subject to pitting and crevice corrosion in warm chloride

environments, and to stress corrosion cracking above about 50°C. 302HQ is considered resistant

to potable water with up to about 200mg/L chlorides at ambient temperatures, reducing to about

150mg/L at 60°C.

Kuumakindlus

Good oxidation resistance in intermittent service to 870°C and in continuous service to 925°C.

Continuous use of Grade 302HQ in 425-860°C range is usually safe (free of carbide precipitation)

as the grade has a very low carbon content.

Kuumtöötlus

Solution Treatment (Annealing) – Heat to 1010-1120°C and cool rapidly. This grade cannot be hardened by thermal treatment.

Külmtöökarastamine

302HQ has the lowest work hardening rate of any of the common austenitic stainless steels. This results in a tensile strength increase of approximately 8MPa/%Ra (8MPa increase in tensile strength for each 1% reduction of area of cold work – this data from wire drawing). Even after substantial cold work this grade remains essentially non-responsive to a magnet.

Keevitus

Stainless steel AISI 304CU (1.4567, X3CrNiCu18-9) has good weldability and can be used with many common welding processes such as TIG welding and MIG welding. It can also be used for arc welding, but this should be carried out with appropriate welding parameters to avoid overheating and distortion. To reduce tension and maintain the mechanical properties, the material should be allowed to cool in the air after welding. No heat treatment is required.

Töödeldavus

AISI 304CU (1.4567) stainless steel is generally machinable, but this material hardens during machining. Therefore, care must be taken to select a sufficient cutting depth. In addition, suitable tools and coolants should be used to prevent overheating and extend tool life.