Making of Rolled Threaded Pipes

1. SHANGHAI PAN-CHINA FASTENING SYSTEM CO.,LTD CHITHREAD ROLLING TECHNOLOGY CO., LTD
GREEN SAFE STEEL NIPPLES
An Brief Introduction to
Rolled Pipe Threads on Galvanized and Black Carbon Steel Pipe
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2. Rolling Thread Technology Via. Cutting
By 2, 3 or more rollers, at room temperature,
to roll the pipe placed in the rollers’ central
axle into the NPT、BSPT or other pipe thread.
It is a kind of mature cold forming, a no-
What is the material-cut-away technology, widely used
in modern industry. But IT has been specially
developed by our Chinese Patent since 2003.
Rolling Thread Technology ?
is
Cutting Thread Technology
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3. I. Rolled Thread Nipples Are Safe Steel Nipples
PCFS – CHITHREAD Green Safe Steel Nipples - Rolled Thread Pipe Steel Nipples
1. Perfect Mating Between Male & Female Thread Increases Leak Tightness Greatly
100% Perfect Thread Teeth Profile – Excellent Teeth Surface Enhance Mating – Zinc Coating Kept – More “Thickness” of Pipe.
2. Excellent Rust-Resistance on Rolled Thread Pipe
1.Original hot-dip zinc coating of the galvanized pipe remains intact, and is not cut away as with lathe cut ones.
2.The density of the rolled thread pipe is increased greatly and makes, at least, the “same thickness” as the original pipe
itself, and forms an anti-oxidization layer of high metallic density against rusty.
3. Pipe Material Not Cut Away Makes Thread Mechanical Connection Much Better
The mechanical properties of the pipe thread are greatly improved as no material is cut away and the weight per unit length of
rolled thread pipe remains unchanged, and further more the metal density is increased.
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4. 1. No Leaking Point Any More
Galvanized Pipe Rolled Thread Nipple Connection with Standard Cast Iron Coupling popular in the Market
Perfect Thread – Excellent Surface Enhance Mating – Zinc Coating Kept – More “Thickness”
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5. 1.1 Perfect Thread - Enhance Mating – Zinc Coating Kept – More “Thickness”
1.1.1 . Perfect Thread: 100% perfect teeth profile (geometry size),
produced by long-life rollers (tools), fundamentally guarantees the
excellent integrity with female cut thread. The cut teeth, by easy-
worn knife (tools), varies in profile time to time, can’t guarantee it.
1.1.2 . Excellent Surface Enhance Mating: Surface roughness of
rolled thread is improved dramatically by 5 – 7 levels to Ra < 0.4
due to the thread to be formed by the roller rolling on the pipe, and
the cut thread is by, knifing in the pipe, Ra > 3.2. Rolling makes
much better mating between the male and the female thread. Rolled Thread Cut Thread
1.1.3 . Zinc Coating Kept: Rolled thread of galvanized pipe is sealed mainly by original zinc
coating which is metallic layer (hard) sealing & very good for suffering the weight of the pipe,
plus traditional tape(soft) sealing. And the cut thread is sealed 100% by tapes(soft) which are un-
appropriate for suffering the weight and can’t be 100% sure for lasting a period of years.
1.1.4. More “Thickness” of The Pipe: As no material is cut away, the weight per unit length remains
same, plus a rolled teeth surface is much harder, those bring improvement in mechanical properties.
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6. 1.2 Factory Lab Max. Working Pressure Test
--- The pressure capacity of rolled thread nipple connection without any sealant, after fracture, is up to 17Kgs
After tensile fracture test, After bend fracture test,
the pressure capacity of the pressure capacity of
the rolled thread nipple the rolled thread nipple
Water Pressure Capacity Test
connection is up to 17kgs. connection is up to 16kgs.
Stainless steel 304 coupling The broken end is sealed
connection with rolled thread by bolt fastened with
nipples without any sealant & tape. sealing tape.
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7. 1.3 Factory Lab Temperature Test from - 20℃ to + 175℃
-- The pressure capacity of rolled thread nipple connection without any sealant is up to 16Kgs
without any sealing tapes
The test procedure:
Fill in the gas into the rolled thread nipple
The result:
connection of piping system without any sealing
No pressure drops down during
tapes at 16Kgs pressure for 24 hrs to check the
& after the 24 hr. continuous test.
changing of the pressure under condition that the
temperature was varied from - 20℃ to + 175℃.
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8. Conclusion: No Leaking Point Any More If female good
Practical、Theory and Test have proven that there is
no leaking point any more in rolled thread cconnection if female thread is qualified.
The Safety Of Rolled Thread Connection Is Much Better Than
Traditional Cut Thread Connection, and its leak tightness is 100% Assured.
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9. 2. Rust Resistance of Rolled Thread Greatly Improved
1.Original hot-dip zinc coating remains intact.
2.After rolling thread, no metal material is cut
away, the weight per unit length is as same The metal grain is not cut off by rolling
as the original pipe, and further more it
increases the metal pipe density on thread
proportion accordingly. High density metal The metal grain is cut off by cutting
layer forms a metallic anti-oxidization layer
against rusty.
The Rolling Thread Technology improves the rust resistance
on thread proportion very greatly.
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10. 2.1. MA & ML SALT ACID SPRAY TEST ON ROLLED NIPPLES
1. Steel Brand:
Tianjin Youfa DN15 Q195
2. Product:
Rolled Thread Galvanized
Welded Steel Nipples.
3. Testing in 50g/L±5g/L
Nacl. solution.
After 130hr. salt acid spray
4. There is no any corrosion
spot appeared after salt acid
spray on the rolled galvanized
steel nipples up to 100 hrs.
continuously.
After 130 hr. continuous salt
MA & ML Test Report
on July 18th, 2008. acid spray, corrosion spots
appear both on thread & pipe.
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11. 2.2. MA SALT ACID SPRAY TEST ON ROLLED & CUT THREAD
Rolling & cutting pipe thread nipples BSP on galvanized steel pipe DN32 of Shanghai Yinhe.
Rolled Thread
Rolled Thread
After
Salt
Acid
Spray
175hrs.
Cut Thread
After
Cut Thread
Salt
Acid
Spray
5hrs.
Painted Cut Thread
Painted Cut Thread
After
Salt
Acid
Spray
24hrs.
Before Salt Acid Spray Test MA Salt Acid Spray Report 11-03-2010 After Salt Acid Spray Test
Corrosion spots appear on rolled thread nipple & cut one after salt acid spray 175 hrs. vs. 5 hrs.
Rust-resistance of rolled pipe nipple is 35 times better than cut thread.
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12. Conclusion: Rust Resistance Greatly Improved By Rolling
Original Zinc Coating remains
intact .
Rolled Thread Nipple
Plus
Not-Cut-Away Metal to be rolled
into Higher Density Metal Pipe.
Cut-Thinner-Wall-Thickness by Cut Thread Nipple
Cut Thread makes the pipe
50% weak than original pipe.
1 + 2
After the zinc coating has been rusted off, the higher density, instead of
cut-thinner-wall-thickness, of the pipe thread still owns stronger rust-resistance.
Total in all, the rust-resistance of the rolled thread
pipe nipples is 40 times higher than cut thread pipe nipples.
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13. 3. Thread Mechanical Connection Greatly Improved
The pipe becomes harder by Rolling Thread Technology instead of thinner by cutting.
Continuous Grain 1.Tensile strength by 150% -1 80％;
2.Flexural strength by 150% - 170％;
3.Shear strength by 140% - 170％;
Cut Grain Off 4.Surface hardness by 130%;
5.Fatigue strength by 250% - 400％.
These percentage will be varied on different pipe thickness, size, material & etc.
Continuous line-like kept ,instead of being cut off, and further
more the metal grains are compressed & are more close to each other.
The metallograph of The metallograph of
Micro Fiber of Pipe Micro Fiber of Pipe
Metal Grain Before Metal Grain After
Rolling. Grade 6 Rolling. Grade 8.5
It improves the organization of original metal fiber grain allocation & makes the pipe much stronger.
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14. 3.1 Rolled Thread Don’t Loss the Material for Teeth Profile and Taper
Teeth height + Taper
are cut away by cutting process.
Mechanical properties of the cut
thread is lower than the original pipe by 30% - 50%.
The cold rolling process doesn’t cut the metal fiber off,
instead the rolling compresses the metal fiber and make
it stronger. Therefore the strength of tension, bend,
shear and fatigue are increased, as well as the surface
hardness. Chi-Thread nipples act very good mechanical
connection performance, and could protect the piping
system well from subsidence, drift and lateral
displacement & etc. under stress.
Rolled thread Cut thread
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15. 3.2 Not Cut-Away-Material Thread & Its Continuous Grain
.
Surface of teeth becomes more harder.
Thicker, harder & more solid
Continuous Grain
Cut Grain Off
After rolling it hardens the teeth bottom by cold compressing micro solid metal fiber from grade 6 to grade 8.5.
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16. 3.3 Mechanical Property Performance Test
Test Material : Force
 Pipe Material Brand: Tianjin Youfa, China;
 Galvanized Steel Pipe: DN15, Q195;
 Wall-Thickness: 2.2mm;
 With Stainless Steel 304 Pipe Coupling.
Test Requirement:
Rolled Thread Nipples connection with stainless
Force
Steel 304 pipe coupling without any sealing tapes.
Turnaround 3 circles by hand, and turnaround 2
circles by tool to fasten the connection.
Experimental Basis:
1. For Tensile Strength Test: <<GB/T228>> Force
Tensile Strength Test Methods for Metal Material at
Room Temperature;
2. For Bend Test: <<GB/T244>> Pull Off Two Rolled Thread Bending Two Rolled Thread
Bend Test Methods for Metal Pipe. Nipples until one of carbon Nipples until one of carbon
steel nipples is fractured. steel nipples is fractured.
Test Institute: Tensile Strength Test Bend Test
Shanghai Quality Supervision & Inspection Station
Of Building Materials & Components.
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17. 3. 4 AL & MA Mechanical Property Performance Test Report
After Mechanical Fracture Without Any Sealing Tapes AL & MA Test Report
in the Connection between the
Test at 54 kN & 70° Rolled Thread Nipple & Coupling.
One of the two rolled thread nipples is
fractured, as showed in yellow circle,
when the tensile load 54.2kN was
applied.
The other of the two rolled thread
Broken Nipple nipples is still connected well with the
stainless steel 304 coupling.
54.2kN
Un-Broken Nipple
One of the two rolled thread nipples is
fractured, as showed in yellow circle,
when the bend test at 70° (d=6a ).
Broken Nipple
The other of the two rolled thread
nipples is still connected well with the
stainless steel 304 coupling.
70° (d=6a )
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18. 3.5 Working Pressure Test after Fracture in Tensile and Bend Test
After Tensile Fracture Test After Bend Fracture Test
it still can afford 17kgs pressure . It still can afford 16kgs pressure.
No leaking at both rolled thread nipple connected with the coupling either for tensile fracture or bend fracture test
Broken Nipple Broken Nipple
No tapes No tapes
Un-broken Nipple Un-broken Nipple
One end of the broken nipple is sealed by a fastener with enough sealing tape to be sure no leaking from this
end. And filling in water to the pipe from the one end of un-broken nipple up to a certain working pressure. It
shows that both coupling connection with broke & un-broken nipples, without any sealing tapes, have a no
leaking at 17 kgs for the one of tensile fracture test and 16 kgs for the bend fracture test respectively.
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19. 3.6 Mechanical Properties Comparison Among Pipe, Cut & Rolled Thread
<<GB/T3091-2008>> Cut Thread Bend
Items Tensile
Welded Pipe For Low - (Earthquake) Test made by Bend
Fracture
Fracture Test Institution
Pressure Fluid Flow National Association of Load
(Degree）
(kN)
Transportation Manufacturers, USA.
Objective
Comparison Basis <<GB / T3091-2008>>
Shanghai Quality
Supervision &
Pipe 41.65 90° Inspection Station
Of Building Materials
& Components.
Shanghai Quality
Rolled Supervision &
Thread 54.2 70° Inspection Station
Nipples Of Building Materials
& Components.
Cut 10.1°,
National Association
Thread 12.3°,
of Manufacturers,
Nipples 14.4°.
USA
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20. 3.7 Rolled Thread Nipples Almost Double The Maximum Working Pressure
The calculations are quoted from the Wheatland Tube Company U.S.A. and it shows that the pipe
after cutting thread significantly decreases the max. working pressure by 32% - 57% on different
size and wall thickness of the welded pipe. In other word, as per previous information in this PPT, the
pipe after rolling thread will not reduces the max. working pressure, and in another word, under same
condition, we can save a huge (12% up) pipe material if we use the rolled thread on the pipe.
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21. 3.8 Sch.40 Pipe May Replace Sch.80 By Rolling Thread Technology
Identification
Carbon Steel Wall Inside
Outside
Pipe Size Thickness Diameter
Diameter Nominal Weight
(inches) -t- -d-
(inches) (Mass) Per Unit (inches) (inches)
Length Plain End
Iron Pipe Schedule
(lb/ft)
Size No.
STD 40 1.13(1.69kg/m) .113 .824
3/4 1.050
XS 80 1.48(2.20kg/m) .154 .742
¾” NPT Cut Thread Steel Nipple Sch. 80
 Take the ¾” DN20 Sch.80 Cutting Pipe Thread as an example:
The ¾” NPT teeth height is 0.057inch(1.45mm) + The taper (1:16) loss is from0.006 – 0.021inch, therefore after cutting,
the original nominal wall thickness was cut off and varies from the min. 0.076inch / 1.93mm (0.154 – 0.057 – 0.021) to
the thickest 0.091inch / 2.295mm (0.154 – 0.057 – 0.006). The thickest after cut thread is only 0.091inch (2.295mm),
19.47% less than the Sch.40 one and the max. working pressure is only 1150 psi as per the calculations last page.
 Take the ¾” DN20 Sch.40 Rolled Pipe Thread as comparison:
The weight (mass) per unit length after rolling (the wall thickness is rolled and compressed) is same as the plain end
pipe itself. i.e. the max. working pressure is 1450 psi as per the calculations from Wheatland Tube Co., last page.
 The max. working pressure of rolled thread ¾” DN20Sch40 pipe or nipple is 26% higher than the cut one of Sch80.
 And at meantime we can easily get the material saved by 0.35 lb/ft ( =1.48 -1.13 ) or 24% ( = 0.35 / 1.48 ).
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22. 3.9 Saving Material on Different Size by Sch.40 Replacing Sch. 80
GREEN CONCLSION:
If rolling thread on the pipe, ¾” SCH.40 pipe
can replace ¾” SCH.80 pipe with 26% higher
max. working pressure as per following table.
The Cut Loss of Pipe Material NPT Thread Sch.80 vs.Sch.40 Rolled Thread
Rolled Thread on
Thinnest Wall Thickest Wall Nominal Weight Sch.40 Better
Nominal Wall Max. Taper Min. Taper
Teeth Height Thickness After Cut Thickness After Cut (Mass) Per Unit Than Cut Thread
NPS DN Schedule Thickness Cut Loss Cut Loss
Thread Thread Length On Sch.80 In
Pressure
Capacity
(mm) (Inch) (mm) (Inch) (mm) (Inch) (mm) (Inch) (mm) (Inch) (mm) (Inch) (kg/m) (lb/ft)
Sch.40 2.77 0.109 1.451 0.057 1.27 0.85
1/2 15 25%
Sch.80 3.73 0.147 1.451 0.057 0.517 0.020 0.164 0.006 1.762 0.070 2.115 0.084
Sch.40 2.87 0.113 1.451 0.057 1.69 1.13
3/4 20 26%
Sch.80 3.91 0.154 1.451 0.057 0.529 0.021 0.164 0.006 1.930 0.076 2.295 0.091
Sch.40 3.38 0.133 1.767 0.070 2.50 1.68
1 25 29%
Sch.80 4.55 0.179 1.767 0.070 0.636 0.025 0.199 0.008 2.147 0.084 2.584 0.101
Sch.40 3.56 0.140 1.767 0.070 3.39 2.27
1-1/4 32 22%
Sch.80 4.85 0.191 1.767 0.070 0.649 0.026 0.199 0.008 2.434 0.095 2.884 0.113
Sch.40 3.68 0.145 1.767 0.070 4.05 2.72
1-1/2 40 18%
Sch.80 5.08 0.200 1.767 0.070 0.649 0.026 0.199 0.008 2.664 0.104 3.114 0.122
Sch.40 3.91 0.154 1.767 0.070 5.44 3.66
2 50 6%
Sch.80 5.54 0.218 1.767 0.070 0.659 0.026 0.199 0.008 3.114 0.122 3.574 0.140
Sch.40 5.16 0.203 2.540 0.100 8.63 5.80
2-1/2 65 20%
Sch.80 7.01 0.276 2.540 0.100 0.902 0.036 0.286 0.011 3.568 0.140 4.184 0.165
Sch.40 5.49 0.216 2.540 0.100 11.29 7.58
3 80 14%
Sch.80 7.62 0.300 2.540 0.100 0.958 0.038 0.286 0.011 4.122 0.162 4.794 0.189
Sch.40 5.74 0.226 2.540 0.100 13.57 9.12
3-1/2 90 8%
Sch.80 8.08 0.318 2.540 0.100 0.994 0.039 0.286 0.011 4.546 0.179 5.254 0.207
Sch.40 6.02 0.237 2.540 0.100 16.07 10.80
4 100 Same
Sch.80 8.56 0.337 2.540 0.100 1.009 0.040 0.286 0.011 5.011 0.197 5.734 0.226
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23. Conclusion: A Safe Pipe Connection Technology - Rolled Thread
1. Minimizing the Leakage in Rolled Thread Nipple Connection.
2. For Galvanized Pipes and Nipples, Original Zinc Coating remains
Intact &, at meantime, Strengthen the Metal Protective Layer.
3. The Performance of Mechanical Connection Greatly Increased.
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24. II. Rolled Thread Nipples Are Green Steel Nipples
 Minimizing possibilities of the leaking in the thread connection of pipe network;
 Saving valuable natural gas, water resources & etc.;
 Saving valuable steel material & saving the sealant & tapes in installation;
 Create a friendly environment for workers both in production and in installation;
 Further enhance the city safety.
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25. Saving Both in Production and Installation
MANUFACTURING
 No metal waste scraps is from rolling thread, material saving;
 Production environment is clear and friendly;
INSTALLATION ON SITE
 More Safety;
 Easy & convenient tightening;
 50% - 70% saving of sealant and tapes;
 A trial test of piping system 100% successful pass in 1st time;
 No re-call work;
 Over 50% efficiency up in installation;
 Daily maintenance on thread connection of piping system zero.
Much improving in quality of piping network installation and safety
& saving a lot of material and labor.
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26. Shanghai Pan-China Fastening System Co., Ltd. Creating Value Chi-Thread Rolling Technology Co., Ltd.
Together with You
Limbiate Italy Trigolo, CR, Italy Mississauga, Ontario, Canada 1307 Souter Dr. Troy, MI, USA
Room502, Nr.1122, XinJinQiao Road, Shanghai, China 201206 Tel: +86-21-61462100 Fax: +86-21-61462118 PCFS@PANCHINAFS.COM
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27. Shanghai Pan-China Fastening System Co., Ltd. Creating Value Chi-Thread Rolling Technology Co., Ltd.
Together with You
In 2009, Chi-Thread Rolling Technology Co., Ltd
was found to focus on developing new applications
of this Chinese Rolling Thread Technology in many
industry sectors in order to benefit our human being.
Room502, Nr.1122, XinJinQiao Road, Shanghai, China 201206 Tel: +86-21-61462100 Fax: +86-21-61462118 PCFS@PANCHINAFS.COM
www.panchinafs.com

28. Shanghai Pan-China Fastening System Co., Ltd. Creating Value Chi-Thread Rolling Technology Co., Ltd.
Together with You
PCFS (Chi-Thread) G.S.S.N., with BSP and NPT threads are supplied in several types of
surface finishing according to domestic and international standards, and guarantees long-
lasting applications in the most diverse usage conditions as the special strong pipe thread.
Room502, Nr.1122, XinJinQiao Road, Shanghai, China 201206 Tel: +86-21-61462100 Fax: +86-21-61462118 PCFS@PANCHINAFS.COM
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29. Shanghai Pan-China Fastening System Co., Ltd. Creating Value Chi-Thread Rolling Technology Co., Ltd.
Together with You
谢 谢！
감사합니다 ありがとう
Gracias
Grazie
Vielen Dank Merci
Спасибо धन्यवा
Ευχαριστούμε Teşekkür ederiz
Thank You！
Room502, Nr.1122, XinJinQiao Road, Shanghai, China 201206 Tel: +86-21-61462100 Fax: +86-21-61462118 PCFS@PANCHINAFS.COM
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