347H stainless steel is a high-temperature, austenitic stainless steel alloy that is commonly used in applications where resistance to high temperatures and corrosive environments is required. It is an enhanced version of the 347 stainless steel grade, with higher carbon content and the addition of tantalum, which provides improved high-temperature strength and resistance to intergranular corrosion.

The "H" in 347H stainless steel stands for "high carbon," indicating a higher carbon content compared to standard grades. The carbon content in 347H stainless steel is typically in the range of 0.04-0.10%, which helps to enhance its high-temperature strength and stability. This alloy also contains chromium, nickel, and small amounts of columbium (niobium) and tantalum, which contribute to its corrosion resistance and overall mechanical properties.

One of the primary advantages of 347H stainless steel is its excellent resistance to intergranular corrosion, which is the corrosion that occurs along grain boundaries in the material. This resistance is achieved through the stabilization provided by the addition of columbium and tantalum, which form carbide precipitates at the grain boundaries, preventing chromium depletion and subsequent corrosion.

Moreover, 347H stainless steel offers good resistance to oxidation and aqueous corrosion, making it suitable for applications in high-temperature environments, such as in the manufacturing of chemical processing equipment, refineries, power generation plants, and other industries involving exposure to elevated temperatures.

The high-temperature strength and thermal stability of 347H stainless steel make it ideal for use in applications where frequent temperature fluctuations occur or where prolonged exposure to high temperatures is expected. Its mechanical properties remain reliable even at temperatures above 800°C (1472°F), providing excellent creep resistance and structural integrity.

In summary, 347H stainless steel is a high-performance alloy with enhanced high-temperature strength, excellent resistance to intergranular corrosion, and good overall corrosion resistance. Its combination of strength, stability, and versatility makes it a popular choice for various applications where reliability and durability in extreme environments are required.

Stainless Steel Seamless Pipe/Stainless Steel Seamless Tube


* Outside Diameter: 4.0mm - 1219.0mm
* Wall Thickness: 0.5mm - 100.0mm
* Length: up to 24m
* Tolerance:  According to the standard
* Technique: Hot rolled/Cold drawn/Forged   
* Surface: Pickling, Polished, Grit blast, 180#, 320#, 400#, Bright Anneal,400#, 500#, 600#
* Standard:  ASTM A312. ASME SA269, ASTM A269, ASME SA213, ASTM A215, ASTM A511, ASTM A789, ASTM A790, ASTM A 268, DIN 2462.1, DIN 17456, DIN 17458, JIS G3463, JIS G3459, GOST 9941, etc.
* Grade: 201, 304, 304L, 316, 316L, 316Ti, 321, 317L, 310S, 347H,  430, 430Ti, 409L, 439, 440C, 446, S32760, 2205, 904L, 630, 631, 253Ma, 254SMo, Incoloy 926, Inconel 625, Monel 400 etc.
* Processing Service: Bending, Welding, Punching, Cutting, etc.
* Pipe End: BE/PE with cap
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Stainless Steel Welded Pipe/Stainless Steel Welded Tube

*  Classification: Stainless steel industry pipe, stainless steel decorative tube
* Outside Diameter: 4.0mm - 1219.0mm
* Wall Thickness: 0.5mm - 20.0mm
* Length: Normally 6.0m, or as requirements
* Tolerance:  According to the standard
* Technique: Hot rolled/Cold drawn   
* Surface: Pickling, Polished, 180#, 320#, 400#, Bright Anneal,400#, 500#, 600#
* Standard:   ASTM A312, ASTM A358, ASTM A249, ASTM A269, ASTM A554, ASTM A790, DIN 17457, JIS 3459, etc
* Grade: 201, 304, 304L, 316, 316L, 316Ti, 321, 317L, 310S, 347H,  430, 430Ti, 409L, 439, 440C, 446, S32760, 2205, 904L, 630, 631, 253Ma, 254SMo, Incoloy 926, Inconel 625, Monel 400 etc.
* Processing Service: Bending, Welding, Punching, Cutting, etc.

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Stainless Steel Capillary Pipe/Stainless Steel Capillary Tube


* Outside Diameter: 0.4mm - 16.0mm
* Wall Thickness: 0.1mm - 2.0mm
* Length: Up to 18000mm, or cut into small pieces 
* Tolerance:  According to the standard
* Technique:  (High Precision) Cold drawn
* Surface:  Inside and Outside Bright Annealed
* Standard:   ASTM A312, ASTM A358, ASTM A249, ASTM A269, ASTM A554, ASTM A790, DIN 17457, JIS 3459, etc
* Grade: 304, 304L, 316, 316L, 316Ti, 321, 317L, 310S, 347H, S32760, 2205, 904L, 630, 631,etc 

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Stainless Steel Sanitary Pipe/Stainless Steel Sanitary Tube

*  Classification: Stainless steel welded sanitary pipe, stainless steel seamless sanitary tube
* Outside Diameter: 6.0mm - 850.0mm
* Wall Thickness: 0.5mm - 6.0mm
* Length: Up to 18000mm, or cut into small pieces 
* Tolerance:  According to the standard
* Technique:  Cold drawn
* Surface:  Inside OR Outside Polished
* Standard:    ASTM A312, ASME SA269, ASTM A269, ASME SA213, ASTM A213, ASTM A511, ASTM A789, ASTM A790, ASTM A376, ASME SA335, SB161, SB163, SB338, SB667, DIN 2462, DIN 17456, DIN 17458, EN 10216, JIS 3463, JIS G3459, GOST 9941, etc
* Grade: 304, 304L, 316, 316L, 316Ti, 321, 317L, 310S, 347H, S32760, 2205, 904L, 630, 631,etc 

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Stainless Steel Square Pipe/Stainless Steel Square Tube

*  Classification: Stainless steel welded square pipe, stainless steel seamless square tube
* Side Length: 4.0*4.0mm - 300.0*300.0mm
* Wall Thickness: 0.25mm - 8.0mm
* Length: Normally 6.0m, or cut into small pieces 
* Tolerance:  According to the standard
* Technique:  Cold drawn/Hot Rolled
* Surface:  Hairline, Polished, 180#, 320#, 400#, Bright Anneal,400#, 500#, 600#
* Standard:   ASTM A312, ASTM A358, ASTM A249, ASTM A269, ASTM A554, ASTM A790, DIN 17457, JIS G3459, etc
* Grade:  201, 304, 304L, 316, 316L, 321, 317L, etc 

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Stainless Steel Rectangular Pipe/Stainless Steel Rectangular Tube

*  Classification: Stainless steel welded rectangular pipe, stainless steel seamless rectangular tube
* Side Length: 4.0*6.0mm - 200.0*400.0mm
* Wall Thickness: 0.25mm - 8.0mm
* Length: Normally 6.0m, or cut into small pieces 
* Tolerance:  According to the standard
* Technique:  Cold drawn/Hot Rolled
* Surface:  Hairline, Polished, 180#, 320#, 400#, Bright Anneal,400#, 500#, 600#
* Standard:   ASTM A312, ASTM A358, ASTM A249, ASTM A269, ASTM A554, ASTM A790, DIN 17457, JIS G3459, etc
* Grade:  201, 304, 304L, 316, 316L, 321, 317L, etc 

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Stainless Steel Coil Pipe/Stainless Steel Coil Tube

*  Classification: O Type, I Type, W Type,  U Type
* Outside Diameter: 6.0 mm - 32.0mm
* Wall Thickness: 0.1mm - 3.0mm
* Length: 150m, 1500m, 1800m, or as requirements
* Tolerance:  According to the standard
* Technique:  Cold drawn/Hot Rolled
* Surface:  Pickling, Polished, 180#, 320#, 400#, Bright Anneal,400#, 500#, 600#
* Standard:  ASTM A269, A249, JIS G 43-5, EN 10216
* Grade:  201, 304, 304L, 316, 316L, 904L, S32205, S31803, etc 

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Q: What kind of ZYTC company?
A: ZYTC is a professional manufacturer of metals and alloy productions and has its own warehouse with more than 30,000 tons capacity. We are working hard to open up the international market. At the same time, we will encounter a variety of purchase orders, In order to meet customer requirements and improve services, we will also distribute some kinds of metal products, of course, our strict procurement management and quality management departments can guarantee excellent quality of all products.
Q: What certificate does ZYTC have?
A: ZYTC acquired the ISO 14001 environmental management system certificate, 0HSAS18001 occupational health and safety management system certificate, and ISO 9001 quality management system certificate.
Q: What's your purchasing system?
A: Our procurement system adopts the 5R principle to ensure the "right quality" from the "right supplier" with the "right quantity" of materials at the "right time" with the "right price" to maintain normal production and sales activities. At the same time, we strive to reduce production and marketing costs to achieve our procurement and supply goals: close relationships with suppliers, ensure and maintain supply, reduce procurement costs, and ensure procurement quality.
Q: Who are your cooperate partners?
A: ZYTC has a very good relationship with world-known factories, such as Baosteel, TISCO, ZPSS, JISCO, ATl, SMC, HAYNES, VDM, ArcelorMittal,  etc.
Q: What are your company's payment methods?
 A: 30% T/T deposit, 70% T/T balance payment before shipment. More payment methods depend on your choices. 
Q: Can you accept small orders?
A: If we have the exact materials in stock, we can deliver even 1 piece. If we don't have the goods in stock, the MOQ is normally 1 ton.
Q: Do you guarantee the safe and reliable delivery of products?
A: Yes, we always use high-quality packaging for shipping. We usually pack the products with a soft material such as polyethylene foam and then pack it in wooden cases to ensure the safety of the product in the process of transportation.
Q: Does ZYTC provide processing services?
A: Yes, we also provide processing services to the outside world, and providing professional services is one of our goals. Such as bending, water cutting, laser cutting, digging holes, welded, slit coil, and other processing according to the drawings.
Q: How to guarantee the quality?
 A: Each production procedure will be subject to testing and evaluation. from the very choice of raw materials to the package for shipment. Only the products surviving all the tests are delivered for export.
Q: What if there is a quality problem?
A: We also keep a piece of the sample before shipping. After comparing the buyer's test result, and it turns out to be our problem, we will return the money back and pay for your lost or delivery of qualified materials again.
Q: Can you provide samples?
A: As a professional company, we know that the quality of products is valued by each customer, especially for international trade, we understand the customer's worries, so we can provide samples to customers, and we can ensure the consistency of the quality of samples and batch product products. The sample is free, but the buyer should pay the freight fee. And the freight fee will be returned in the future order.
Q: How about the delivery time?
A: Stock products can be shipped within 3 days. Customized product delivery time is normally 25 working days, but it is also influenced by the specific requirements or the order quantity. Partial shipment is allowed.