St52 SAE1518 Q345b Thick Wall High Wall Thickness Prime Quality Ms Mild Black Metal Iron Carbon Steel Hollow Bar

• Type: Seamless
• Technique: Hot Rolled
• Material: Carbon Steel
• Surface Treatment: Black
• Usage: Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Food/Beverage/Dairy Products, Machinery Industry, Chemical Industry, Mining, Construction & Decoration, Special Purpose
• Section Shape: Round
• Model NO.: st52/sae1518/q345b
• Steel Pipe Type: Thick Wall Steel Pipe
• Stock Size: Od*ID32mm*20mm- Od*ID580mm*420mm
• Stock Size MOQ: 1 Bar
• Stock Size Delivery Time: 1 Day
• New Production Size MOQ: 5 Tons
• New Production Deliveyr Time: 7 Days
• Grades: A106, A53, SAE1018
• Packing: in Bundles with Tarpaulin Covering
• Payment Terms: 30% T/T in Advance, The Balance by Email Copy Bl
• Trade Terms: EXW, Fob, CFR, CIF
• Fabrication Type: Cutting
• Fabrication Type 2: Bending
• Fabrication Type 3: Welding
• Fabrication Type 4: Machining
• Loading Seaport: Tianjin Port, China
• Transport Package: in Bundles
• Specification: OD57*ID53MM
• Trademark: TJEMERSON
• Origin: Tianjin, China
• HS Code: 7304399000
• Production Capacity: 2000tons /Month

Product Description

seamless pipes grades and production methods
1. Round bar making Hollow Bar
   according to customer's demanded material to produce the round bar, then making annealled heat treatment, then drill the hole as customer demanded inner diameter into the round bar, round bar piercing, making rough hole, then make precision processing to make outer diameter and inner diameter as requested. Any size hollow bar can be produced as demanded.

 Tolerance for hollow round bar, forged round bar drilling hole hollow bar ASME SA530

Type	Outer diameter(inner diameter)	Allowed tolerance	Wall thickness allowed tolerance
Outer diameter	≥219-457.2mm	-0.8 - +2.4mm	-0.8 - +4.0mm
	>457.2-660.4mm	-0.8 - +3.2mm
	>660.4-863.6mm	-0.8 - +4.0mm
	>863.6mm	-0.8 - +4.8mm
Inner diameter	All size	-1.6- 0mm	0 - +3.2mm

length tolerance -0 - +50mm
Round bar making Hollow bar cost is high
2. Hot rolled Hollow Bar
using hot rolled steel pipe billet to make heating and piercing, elongating, sizing and stranghtening, cooling, finally hollow bars finished, this is the type most commonly used. Because it is hot rolled, so cost is lowest, but it is suit for large quantity, for small quantity, have to make cold drawn or round bar piercing. size: outer diameter 32mm- 499mm, wall thickness 4mm- 80mm
3. Cold drawn Hollow Bar
 for outer diameter not over than 63.5mm, small size hollow bar, when demanded quantity is under 5 tons, usually make cold drawn hollow bar, using larger size hot rolled hollow bar to draw to the size demanded.
some size can be finished only by one time drawing, but some other sizes might need twice or three times to finish drawing, it takes time, so the cost is higher.
cold drawn size outer diameter 32mm- 63.5mm
4. Hot- expanding Hollow Bar
 For hollow bar sizes are special, not common sizes, have to use smaller thick wall hollow bar to hot expand to be larger size hollow bar, but the technical property for hot-expanded hollow bar will be lower than the original hollow bar. Size: outer diameter over 356mm.
hollow bar grades can be supplied
hollow bar grades

Descriptions	Grades
Structural pipe	20# 35# 45# Q345B, 16Mn, Q345B-E, 20Mn2, 25Mn, 30Mn2, 40Mn2, 45Mn2 SAE1018, SAE1020, SAE1518, SAE1045.
Liquid pipe	20# q295b-e, q345b-e
High pressure boiler tube	20G 15MnG 20MnG 15CrMoG, 12Cr1MoVG St35.8, sa106b, sa106c, sa210a, sa210c, A333P2, A333P11, A33P12, A333P22, A33P36, A333P91, A333P92, A335T2, A335T11, A335T12, A335T22, A335T91, A335T23, A335T9
Pipeline	API SPEC 5L, X42, X52, X60, X65,X70,X80 ASTMA53, ASTM A106, ASTM A333, BS301, BS3602, BS3603, BS3604, PSL1, PSL2, DNV-OS-F101, CSA-Z245
Alloy pipe	4140, 42CrMo, 32CrMo, 15CrMo,
Packing	Black paint, Varnish painting, Tarpaulin packing
End	Common round end, beveled.
Processing	Galvanizing; cutting; making thread outside the pipe; Machining.
outer diameter	16mm- 800mm
wall thickness	4mm- 80mm

HOLLOW BAR chemical composition and technical property

Standard	Grade	C max	Mn max	Ti	V	Si max	P	S	Yield strength max	Tensile strength	Elongation%
ASTM A29	Sae1518	0.21	1.10-1.40	0.16	0.14	0.20	0.04	0.05	235	375-470	25
GB/T3274-2007	Q345B	0.22	1.0-1.60	0.18	0.15	0.30	0.045	0.030	235	375-460	21-26

seamless pipe production



the seamless pipes stock detail


hollow bar containers loading

hollow bar bulk vessel packing and loading

seamless pipes processing and fabrication






company introduction:
Tianjin Emerson Commercial and Trade co., Ltd located in Tianjin the largest seaport in north of China, has more than 10 years of experience in Iron and Steel materials, has large stock for steel raw materials. Tianjin Emerson products category: hot rolled steel plate and steel sheet, medium thick steel plate, stainless steel sheet and plate, galvanized steel sheet, and checkered steel sheet and plate; hot rolled steel coils, cold rolled steel coil, galvanized steel coil and stainless steel coils; seamless steel pipe, welded steel pipe, hollow bar, galvanized steel pipe, square pipe, rectangular steel pipe, and stainless steel pipes; steel bar, hot rolled steel bar, forged bar, rebar, deformed bar and other steel profiles. Except the steel raw materials, Tianjin Emerson can make steel fabrication and processing on steel raw materials: sheet metal fabrication, steel sheet laser cutting, steel sheet CNC flame cutting, steel sheet waterjet cutting, steel products welding and machining; make steel structure, and can make all types of steel parts or equipment by drawings. Emerson supplies good service for customer, good quality products, fast delivery, and good after-sale service, Tianjin Emerson hopes to build good cooperation with everyone interested.
We are a dynamic and dependable company. You can count on us to supply the right grade and the right size at the right price - delivered right on time, every time. Our innovative approach means you get the benefit of state-of-the-art technology coupled with personal professional service. The result is a business partner striving to meet your needs to help your business grow.
WHY CHOOSE US:
good quality!  fast delivery time!  good after-sale service
looking forward to your kind contact