ASTM A312/A312M 304H stainless steel seamless pipe supplier, 304H cold drawn seamless tube manufacture

Short Description:

304/304H (UNS S30400/ S30409) is a modification of the most widely utilized “18-8″ chromium-nickel austenitic stainless steel. The carbon content is controlled in the range of 0.04-0.10% for increased strength at temperatures above 800°F (427°C). It is an economical and versatile corrosion resistant alloy suitable for a wide range of general purpose applications.

It is common practice for 304H to be dual certified as 304 and 304H. The high carbon chemistry of 304H enables 304 to meet the mechanical properties and grain size requirements of 304H.

304/304H has general corrosion resistance similar to 304/304L. It resists atmospheric corrosion, as well as, moderately oxidizing and reducing environments. However, because of its high carbon content, 304/304H is subject to carbide precipitation in the heat affected zone of welds.

304/304H is non-magnetic in the annealed condition, but can become slightly magnetic as a result of cold working or welding. It can be easily welded and processed by standard shop fabrication practices.

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Applications

304H is often used as a material of construction up to about 1500oF. Some examples of applications that 304H is commonly used for includes:

▪ Most commonly used in petroleum refineries
▪ Boilers
▪ Heat exchangers
▪ Condensers
▪ Pipelines
▪ Cooling towers
▪ Steam exhausts
▪ Electric generation plants
▪ On occasion will be found in fertilizer and chemical plants

304H related grades:
ASTM/ASME: UNS S30409
EURONORM: FeMi35Cr20Cu4Mo2
DIN: 2.4660

304H Chemical Composition

	Cr	Ni	C	Si	Mn	P	S	N
304H	18 min	8 min	0.04 min
304H	20 max	10.5 max	0.1 max	0.75 max	2.0 max	0.045 max	0.03 max	0.1 max

304H Mechanical Properties

Grade	Tensile StrengthKsi(min)	Yield Strength 0.2% offset Ksi(min)	Elongation(min)	Hardness HB Max	Hardness HRB Max
304H	75	30	40	201	92

Available Sizes and Specifications

304H stainless steel strip sizes and specifications
Grade	304H
Cold rolled stainless steel strip	Thickness: 0.3mm- 3.0mm, Width: 5mm - 900mm,Surface: 2B/BA/SB/8K/HL/1D/2D etc
Hot rolled stainless steel strip	Thickness: 3.0mm - 16mm, Width: 10mm - 900mmSurface: No.1/pickling
Stainless steel foil	Thickness: 0.02mm- 0.2mm, Width: Less than 600mm, Surface: 2B
Standard	ASTM A240/A480, ASTM B688, ASTM B463/SB463, ASTM B168/SB168, ASTM B443/SB443/B424/SB424B625/SB625 B575/SB575, JIS G4303, BS 1449, DN17441, G4305

304H stainless steel coil sizes and specifications
Grade	304H
Cold rolled stainless steel coil	Thickness: 0.3mm- 3.0mm, Width: 1000mm - 2000mm,Surface: 2B/BA/SB/8K/HL/1D/2D etc
Hot rolled stainless steel coil	Thickness: 3.0mm - 16mm, Width: 1000mm - 2000mmSurface: No.1/pickling
Standard	ASTM A240/A480, ASTM B688, ASTM B463/SB463, ASTM B168/SB168, ASTM B443/SB443/B424/SB424B625/SB625 B575/SB575, JIS G4303, BS 1449, DN17441, G4305

304H stainless steel pipe sizes and specifications
Grade	304H
Stainless steel seamless pipe	Outside diameter: 4.0 - 1219mm, Thickness: 0.5 -100mm,Length: 24000mm
Stainless steel welded pipe	Outside diameter: 6.0 - 2800mm, Thickness: 0.3 -45mm,Length: 18000mm
Stainless steel capillary pipe	Outside diameter: 0.4 - 16.0mm, Thickness: 0.1 -2.0mm,Length: 18000mm
Stainless steel welded sanitary pipe	Outside diameter:8.0- 850mm, Thickness: 1.0 -6.0mm
Stainless steel seamless sanitary pipe	Outside diameter: 6.0- 219mm, Thickness: 1.0 -6.0mm
Stainless steel square pipe	Side Length: 44 - 300300mm, Thickness: 0.25 - 8.0mm, Length: 18000mm
Stainless steel rectangular pipe	Side Length: 46 - 200400mm, Thickness: 0.25 - 8.0mm, Length: 18000mm
Stainless steel coil pipe	Outside diameter: 0.4 - 16mm, Thickness: 0.1 - 2.11mm
Standard	American Standard: ASTM A312, ASME SA269, ASTM A269, ASME SA213, ASTM A213 ASTM A511 ASTM A789, ASTM A790, ASTM A376, ASME SA335, B161, SB163, SB338, SB667/668Germany Standard: DIN2462.1-1981, DIN17456-85, DIN17458-85·European Standard: EN10216-5, EN10216-2Japanese Standard: JIS G3463-2006, JISG3459-2012Russian Standard: GOST 9941-81

304H stainless steel profile sizes and specifications
Grade	304H
Specification	EN, DIN, JIS, ASTM, BS, ASME, AISI, ISO
Standard	ASTM A276/ASME SA276, ASTM A479/ASME SA479 & ASTM A164/ASME SA164 .
Stainless steel round Bar	Diameter: 2mm - 600mm
Stainless steel bright Bar	Diameter: 2mm - 600mm
Stainless steel hex Bar	Dimension: 6mm - 80mm
Stainless steel square bar	Dimension: 3.0 - 180mm
Stainless steel flat bar	Thickness: 0.5mm - 200mm, Width: 1.5mm - 250 mm
Stainless steel angle bar	as requirements
Length	Normally 6m, or produce as requirements
Surface	Black, Bright. Peeled and Polished, Solution annealed.
Delivery condition	cold drawn, hot rolled, forged, grinding, centerless grinding
Tolerance	H8, H9, H10, H11, H12, H13,K9, K10, K11, K12 or as per clients’ requirements