stainless steel coil stainless steel sheet / plate stainless steel angle stainless flat bar No.4 / HL / BA / Checkered plate stainless steel decoration round pipe stainless steel seamless pipe stainless steel square pipe stainless steel rectangular pipe stainless steel channel

stainless steel seamless pipe

321 stainless steel seamless pipe

About 321 stainelss steel seamless steel pipe

321 Seamless pipe is a hollow section, no seams around the strip steel. The wall is thicker, it is more economical and practical, the wall thickness of the thinner, processing costs will be substantially increased it; 

the product process to determine its performance limitations, generally low precision seamless steel pipe: uneven thickness, the appearance of low brightness tube length into this is high, and the inner surface pitting and black spots difficult to remove; detection and plastic must be processed offline. Therefore, it shows its superiority in high pressure, high strength and mechanical structure.



321 Chemical compostion 

C(%)Si(%)Mn(%)Cr(%)P(%)S(%)Ti(%)Ni(%)Cu(%)
≤0.08≤1.00≤2.0017.0-19.0≤0.035≤0.03≥5×C%9.0-12.0---

321 Mechanical property

抗拉强度(Mpa)
tensile strength
屈服强度(Mpa)
Yield Strength
伸长率(%)
Elongation
≥520≥205≥40


Standard size for 321 stainlss seamless steel pipe 

英寸
Inch
公称通径(mm)
DN
外径(mm)
OD
壁厚标准(Standards of wall thickness)
SCH5sSCH10sSCH10SCH20SCH30SCH40SCH60SCH80SCH100SCH120
1/8DN610.31.241.732.42
1/4DN813.71.652.243.02
3/8DN1017.11.652.313.2
1/2DN1521.31.652.112.773.73
3/4DN2026.71.652.112.873.91
1DN2533.41.652.773.384.55
1-1/4DN3242.21.652.773.564.85
1-1/2DN4048.31.652.773.685.05
2DN5060.31.652.773.915.54
2-1/2DN6573.02.113.055.167.01
3DN8088.92.113.055.497.62
3-1/2DN90101.62.113.055.748.08
4DN100114.32.113.056.028.5811.13
5DN125141.32.773.46.559.5312.7
6DN150168.32.773.47.1110.9714.27
8DN200219.12.773.766.357.048.1810.3112.715.0918.26
10DN250273.13.404.196.357.89.2712.715.0918.2621.44
12DN300323.93.964.576.358.3810.3114.2717.4821.4425.4
14DN350355.53.964.786.357.929.5311.1315.0919.0523.8327.79
––


Classification for 321 stainless seamless steel tubes

According to rolling technical : 

1)Hot rolling and hot extrusion .2)Cold rolled: 

According to the Different metallographic structure:

Austenitic stainless steel seamless pipe


Standards for Specifications and appearance quality

A:GB14975-2002/ASTM A240

Hot rolling length:1.5m-10.0mm. hot extrusion length:≥1m.  Cold rolling: wall thickness0.7mm-1.0mm,lenght1.0m-7.0m.Wall thickenss≥1.0mm,the lenght must be 1.5m-8.0mm.

B: Hot rolling technical: Outsise meter - 54.0mm-480mm.  Wall thickness - 4.5mm-45mm.

Cold rolled technical: Outside meter - 6.0mm-200mm.   Wall thickness - 0.5mm-21mm.

C:  Standards for wall thickness

Both inside and outside the pipe surface shall not have cracks, folding, cracking, crack, rolling reduction, separation and scarring and defects, these defects should be completely removed (except for machining tube), after the removal of the outer wall thickness and shall not exceed the negative deviation. Where no more than the allowable negative deviation of the other minor surface defects can not be cleared.

D:  Straight channel depth. Hot rolled, hot extruded steel pipe, the diameter is less than or equal to 140mm less than 5% of the nominal wall thickness, the maximum depth of not more than 0.5mm; cold drawing (rolling) steel is not greater than 4% of the nominal wall thickness, the maximum depth of not more than 0.3mm.

E: Both ends of the steel pipe should be cut into a right angle, and remove the burr.


All kinds of production standards for 321 stainless seamless steel pipe

GB2270-80Usually for common stainelss seamless pipe standard
GB/T14976-94Stainless seamless steel pipe for fluid delivery
GB/T14975-94Stainless steel seamless steel pipe for structure
GB13296-91Stainless steel seamless steel tubes for boilers and heat exchangers
(GJB2608-96)
(YB676-73)
Aerospace structure steel thick wall seamless steel pipe
(GJB2296-95)
(YB678-71)
Stainless seamless steel pipe for aviation
GB3089-92Stainless acid resistant and extremely thin wall seamless steel pipe
GB9948-88Seamless steel pipe for petroleum cracking
ASTM A213Ferrite and austenitic alloy steel seamless steel tubes for boilers and heat exchangers
ASTM A269General purpose austenitic stainless steel seamless steel pipe and welded steel pipe
ASTM A312 Austenitic stainless steel seamless steel pipe welded steel pipe
ASTM A450General requirements for carbon, Ferritic and austenitic alloy steel.
Q/HYADSeamless steel pipe for chemical industry


(YB/T679-97)
(YB679-71)
Aerospace 18A hollow rivet thin wall seamless steel 
pipe
(GJB2609-96)
(YB680-71)
Thin wall seamless steel pipe for aviation structure
(YB/T681-97)
(YB681-71)
20A thin wall seamless steel pipe for aviation use
GB3090-82Stainless steel small diameter steel pipe
GB5310-95Seamless steel tube for high pressure boiler
GB3087-82Low and medium pressure seamless steel pipe
ASTM A530General requirements for Ferritic and alloy steels 
for specialized purposes
ASTM A789Austenitic stainless steel seamless steel pipe and welded steel pipe
JIS G3456-88Stainless steel tube for mechanical structure
JIS G3448-88Stainless steel tubes for ordinary pipes
JIS G3459-88Pipe with stainless steel pipe
JIS G3463-88Stainless steel tube for boiler and heat exchanger


Theoretical weight for cold rolling stainelss seamless steel pipe (KG/M)

WT
0.50.60.70.80.91.01.21.52.02.53.03.5
OD
9.50.1110.1310.1510.1710.1900.2090.2450.295--------
12.70.1500.1790.2070.2340.2610.2880.3400.414--------
15.90.2260.2620.2970.3320.3670.4350.5320.685------
190.2280.2720.3150.3590.4010.4430.5260.6470.8381.017----
220.2650.3160.3670.4180.4680.5170.6150.7580.9861.202----
250.3020.3610.4190.4770.5340.5910.7040.8691.1341.387----
280.4710.5360.6010.6650.7930.9801.2821.572----
31.80.4610.5360.6110.6850.7590.9051.1201.4691.8062.1312.442
38.10.6450.7350.8250.9141.0191.3531.7802.1942.5962.986
50.80.8640.9861.1071.2281.4671.8232.4062.9773.5364.082
601.0231.1671.3111.4541.7402.1632.8603.5444.2164.876
63.51.2361.3891.5411.8432.2933.0333.7604.4755.178
76.21.6711.8542.2192.7633.6594.5435.4156.274
88.92.5953.2324.2855.3266.3547.371
101.62.9713.7024.9126.1097.2948.467
1083.1603.9395.2276.5047.7679.019
1143.3374.1615.5236.8738.2119.537
1273.7224.6426.1657.6759.17310.659
1333.9004.8646.4618.0459.61711.177
1414.1365.1606.8558.53810.20911.867
1595.8257.7439.64811.54113.385
1688.18710.20312.20614.197
21910.70013.34716.97918.599


Appication for 321 seamless pipe 

Seamless with wide usage in oue daily life.Such as Drinking water system, hot water system and the safety and sanitation in the first water supply system, building water supply pipe etc filed.

More widely used in aviation field, boiler manufacturing tube, heat exchanger, petroleum, chemical industry, industrial pipe, machinery.


Calculating formula for weight(KG/M)

{(Outside meter-wall thickness)×wall thickness}×0.02466=KG/M

Online Inquiry:
Related products
310S stainelss steel seamless pipe More>>
316L stainless steel seamless pipe More>>
304 stainless steel seamless pipe More>>