ASTM Standard Competitive Price 304/316/316L Stainless Steel Round Tubes Seamless Welded Pipe

Products Specification

630 Stainless Steel Seamless Tubing - Product Information

*(UNS S17400 / 17-4PH Precipitation-Hardening Stainless Steel)*

630 Seamless Tubing is a martensitic precipitation-hardening stainless steel offering exceptional strength, corrosion resistance, and machinability. The "630" designation (per AMS/UNS) is synonymous with 17-4PH. Supplied in solution-annealed Condition A, it achieves high mechanical properties via low-temperature aging heat treatment (e.g., H900, H1150). Ideal for high-stress, corrosive, and moderate-temperature applications where standard austenitic steels (304/316) lack sufficient strength.

• Density: 0.282 lb/in³ (7.80 g/cm³)

• Melting Point: 2560-2625°F (1400-1440°C)

• Magnetic Response: Yes (martensitic structure)

• Thermal Conductivity: 14.4 BTU·ft/hr·ft²·°F (24.9 W/m·K)

• Corrosion Resistance: Comparable to 304 stainless; resistant to acids, freshwater, steam, and petroleum.

• Standard: Bundled with plastic/corrugated wrapping, wood-crated or palletized.

• Protection: PVC end caps, VCI (vapor corrosion inhibitor) paper for long-term storage.

• Labeling: Heat number, size, temper, quantity, and compliance marks (RoHS/REACH).

• Cutting: Precision saw, abrasive waterjet, or laser cutting.

• Heat Treatment: Custom aging (H900 to H1150M) for target strength/toughness.

• Machining: CNC turning, milling, threading, grooving.

• Surface Treatment: Passivation, electropolishing, bead blasting.

• Testing: Eddy current (ECT), hydrostatic, ultrasonic (UT), PMI (positive material identification).

• Welding: TIG/GTAW with ER630 filler wire.

630 seamless tubing is critical in high-performance sectors:

• Aerospace: Landing gear, actuator cylinders, hydraulic lines.

• Oil & Gas: Downhole tools, valve stems, chemical injection tubing.

• Medical: Surgical instruments, implantable device components (biocompatible grades available).

• Power Generation: Turbine blades, heat exchanger tubes.

• Industrial: Hydraulic/pneumatic cylinders, bearings, nuclear waste containers.

• Marine: Propeller shafts, subsea fittings.

• Mill Test Reports (MTRs) per EN 10204 3.1/3.2.

• Compliance: NACE MR0175, ASTM A262, AMS 5643.

• Certifications: ISO 9001, AS9100, PED 2014/68/EU (upon request).

Zhongzheng Stainless Steel Co., Ltd. was established in 2018 with aregistered capital of 20 million yuan. lt is a manufacturing company thatintegrates the production of special materials, manufacturing andprocessing, sales, and technology development. The company covers anarea of 2,000 square meters and has 200 employees. it has built worldclass stainless steel seamless pipe (hot piercing, cold drawing, cold rollingproduction lines, precision steel pipe production lines, and large, mediumand small-sized welded pipe production lines. The company has beencommitted to providing high performance, high precision, hightemperature-resistant, high pressure-resistant, and corrosion-resistantsolutions and technical services for industrial equipment pipeline systems.The company specializes in producing a series of steel pipes, pipe fittingsflanges, etc., such as high-temperature (nickel-based) alloys, austeniticduplex steel, urea grade stainless steel, super stainless steel, etc. Thecompany is equipped with an annual production capacity of 5,000 tons ofstainless steel seamless pipe production line, 7,000 tons of welded pipeproduction line, and 500 tons of pipe fittings production line, etc. lt canoroduce stainless steel seamless pipes with diameters ranging from ‌Φ‌6 to‌Φ‌762 and wall thicknesses ranging from 0.5 to 70 mm, stainless steelwelded pipes with diameters ranging from ‌Φ‌15 to ‌Φ‌2200 and wallthicknesses ranging from 0.5 to 80 mm, pipe fittings, and various stainlesssteel ingots, round steel, rough pipes, etc., according to customerrequirements and in accordance with standards such as GB, ASTM, etc.

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