KS D3568 Carbon Steel Structural Steel Tubes Introduction
KS D3568 structural pipe is a carbon steel circular welded pipe manufactured according to the Korean Industrial Standard KS D3568. It is commonly used in building frames, bridge structures, and industrial equipment for load-bearing and anchoring purposes.
KS D3568 Carbon Steel Structural Steel Tubes Advantages
High Dimensional Precision
During the manufacturing process, this product utilizes rigorous rolling and cold straightening processes, resulting in an outer diameter tolerance of ±0.5mm and a wall thickness deviation typically exceeding ±10%. This high-precision dimensional control ensures a perfect fit during pipe installation and docking.
High Strength
KS D3568 structural pipe is hot-rolled from high-quality carbon steel, achieving a yield strength exceeding 245MPa and a tensile strength exceeding 400MPa. It resists deformation even under long-term heavy loads.
Excellent Surface Quality
During production, KS D3568 structural pipe uses a high-speed brush roller to thoroughly remove the oxide layer, ensuring a smooth, flat surface free of visible defects such as cracks, folds, or slag inclusions. This ensures secure adhesion of subsequent spray coatings.
KS D3568 Carbon Steel Structural Steel Tubes
Form:Round Tube,Square tubing,Rectangular steel tube
Grades:SPSR 400,SPSR 490
Application: KS D3568 SPSR400, SPSR490 is used for civil engineering architecture and other structures.
KS D3568 Chemical Analysis
|
Steel Grade |
Chemical Composition % |
||||
|
C |
Si |
Mn |
P |
S |
|
|
SPSR 400 |
0.25 max. |
- |
- |
0.040 max. |
0.040 max. |
|
SPSR 490 |
0.18 max. |
0.55 max. |
1.50 max. |
0.040 max. |
0.040 max. |
KS D3568 Carbon Steel Structural Steel Tubes Mechical Properties
|
Steel Grade |
Tensile strength |
Yield Strength |
Elongation % |
|
N/?{kgf/?} |
N/?{kgf/?} |
(No.5 test piece) |
|
|
SPSR 400 |
400 {41} min. |
245 {25} min. |
23 min. |
|
SPSR 490 |
490 {50} min. |
325 {33} min. |
23 min. |
KS D3568 Square Tube Dimension
|
Side length |
Wall thickness |
Unit mass |
Informative refrence |
|||
|
Cross sectional area |
Geomerical moment of inertia |
Modulus of section |
Redius of gyration of area |
|||
|
A×B |
t |
? |
?4 |
? |
? |
|
|
mm |
mm |
kg/m |
Ix, Iy |
Zx, Zy |
ix, iy |
|
|
20x20 |
1.2 |
0.697 |
0.865 |
0.53 |
0.52 |
0.769 |
|
20x20 |
1.6 |
0.872 |
1.123 |
0.67 |
0.65 |
0.751 |
|
25x25 |
1.2 |
0.867 |
1.105 |
1.03 |
0.824 |
0.965 |
|
25x25 |
1.6 |
1.12 |
1.432 |
1.27 |
1.02 |
0.942 |
|
30x30 |
1.2 |
1.06 |
1.345 |
1.83 |
1.22 |
1.17 |
|
30x30 |
1.6 |
1.38 |
1.752 |
2.31 |
1.54 |
1.15 |
|
40x40 |
1.6 |
1.88 |
2.392 |
5.79 |
2.9 |
1.56 |
|
40x40 |
2.3 |
2.62 |
3.332 |
7.73 |
3.86 |
1.52 |
|
50x50 |
1.6 |
2.38 |
3.032 |
11.7 |
4.68 |
1.96 |
|
50x50 |
2.3 |
3.34 |
4.252 |
15.9 |
6.34 |
1.93 |
|
50x50 |
3.2 |
4.5 |
5.727 |
20.4 |
8.16 |
1.89 |
|
60x60 |
1.6 |
2.88 |
3.672 |
20.7 |
6.89 |
2.37 |
|
60x60 |
2.3 |
4.06 |
5.172 |
28.3 |
9.44 |
2.34 |
|
60x60 |
3.2 |
5.5 |
7.007 |
36.9 |
12.3 |
2.3 |
|
75x75 |
1.6 |
3.64 |
4.632 |
41.3 |
11 |
2.99 |
|
75x75 |
2.3 |
5.14 |
6.552 |
57.1 |
15.2 |
2.95 |
|
75x75 |
3.2 |
7.01 |
8.927 |
75.5 |
20.1 |
2.91 |
|
75x75 |
4.5 |
9.55 |
12.17 |
98.6 |
26.3 |
2.85 |
|
80x80 |
2.3 |
5.5 |
7.012 |
69.9 |
17.5 |
3.16 |
|
80x80 |
3.2 |
7.51 |
9.567 |
92.7 |
23.2 |
3.11 |
|
80x80 |
4.5 |
10.3 |
13.07 |
122 |
30.4 |
3.05 |
|
90x90 |
2.3 |
6.23 |
7.932 |
101 |
22.4 |
3.56 |
|
90x90 |
3.2 |
8.51 |
10.85 |
135 |
29.9 |
3.52 |
|
100x100 |
2.3 |
6.95 |
8.852 |
140 |
27.9 |
3.97 |
|
100x100 |
3.2 |
9.52 |
12.13 |
187 |
37.5 |
3.93 |
|
100x100 |
4 |
11.7 |
14.95 |
226 |
45.3 |
3.89 |
|
100x100 |
4.5 |
13.1 |
16.67 |
249 |
49.9 |
3.87 |
|
100x100 |
6 |
17 |
21.63 |
311 |
62.3 |
3.79 |
|
100x100 |
9 |
24.1 |
30.67 |
408 |
81.6 |
3.65 |
|
100x100 |
12 |
30.2 |
38.53 |
471 |
94.3 |
3.5 |
|
125x125 |
3.2 |
12 |
15.33 |
376 |
60.1 |
4.95 |
|
125x125 |
4.5 |
16.6 |
21.17 |
506 |
80.9 |
4.89 |
|
125x125 |
5 |
18.3 |
23.36 |
553 |
88.4 |
4.86 |
|
125x125 |
6 |
21.7 |
27.63 |
641 |
103 |
4.82 |
|
125x125 |
9 |
31.1 |
39.67 |
865 |
138 |
4.67 |
|
125x125 |
12 |
39.7 |
50.53 |
103x10 |
165 |
4.52 |
|
150x150 |
4.5 |
20.1 |
25.67 |
896 |
120 |
5.91 |
|
150x150 |
5 |
22.3 |
28.36 |
982 |
131 |
5.89 |
|
150x150 |
6 |
26.4 |
33.63 |
115x10 |
153 |
5.84 |
|
150x150 |
9 |
38.2 |
48.67 |
158x10 |
210 |
5.69 |
|
175x175 |
4.5 |
23.7 |
30.17 |
145x10 |
166 |
6.93 |
|
175x175 |
5 |
26.2 |
33.36 |
159x10 |
182 |
6.91 |
|
175x175 |
6 |
31.1 |
39.63 |
186x10 |
213 |
6.86 |
|
200x200 |
4.5 |
27.2 |
34.67 |
219x10 |
219 |
7.95 |
|
200x200 |
5 |
35.8 |
45.63 |
283x10 |
283 |
7.88 |
|
200x200 |
6 |
46.9 |
59.79 |
362x10 |
362 |
7.78 |
|
200x200 |
9 |
52.3 |
66.67 |
399x10 |
399 |
7.73 |
|
200x200 |
12 |
67.9 |
86.53 |
498x10 |
498 |
7.59 |
|
250x250 |
5 |
38 |
48.36 |
481x10 |
384 |
9.97 |
|
250x250 |
6 |
45.2 |
57.63 |
567x10 |
454 |
9.92 |
|
250x250 |
8 |
59.5 |
75.79 |
732x10 |
585 |
9.82 |
|
250x250 |
9 |
66.5 |
84.67 |
809x10 |
647 |
9.78 |
|
250x250 |
12 |
86.8 |
110.5 |
103x102 |
820 |
9.63 |
|
300x300 |
4.5 |
41.3 |
52.67 |
763x10 |
508 |
12 |
|
300x300 |
6 |
54.7 |
69.63 |
996x10 |
664 |
12 |
|
300x300 |
9 |
80.6 |
102.7 |
143x102 |
956 |
11.8 |
|
300x300 |
12 |
106 |
134.5 |
183x102 |
122x10 |
11.7 |
|
350x350 |
9 |
94.7 |
120.7 |
232x102 |
132x10 |
13.9 |
|
350x350 |
12.5 |
124 |
158.5 |
298x102 |
170x10 |
13.7 |
KS D3568 Rectangular Steel Tube Dimension
|
Side length |
Wall thickness |
Unit mass |
Informative reference |
||||||
|
Cross sectional area |
Geomerical moment of inertia |
Modulus of section |
Radius of gyration of area |
||||||
|
A×B |
t |
? |
?4 |
? |
? |
||||
|
mm |
mm |
kg/m |
Ix |
Iy |
Zx |
Zy |
ix |
iy |
|
|
30x20 |
1.2 |
0.868 |
1.105 |
1.34 |
0.711 |
0.89 |
0.711 |
1.1 |
0.802 |
|
30x20 |
1.6 |
1.124 |
1.4317 |
1.66 |
0.879 |
1.11 |
0.879 |
1.8 |
0.784 |
|
40x20 |
1.2 |
1.053 |
1.3453 |
2.73 |
0.923 |
1.36 |
0.923 |
1.42 |
0.828 |
|
40x20 |
1.6 |
1.357 |
1.7517 |
3.43 |
1.15 |
1.72 |
1.15 |
1.4 |
0.81 |
|
50x20 |
1.6 |
1.63 |
2.072 |
6.08 |
1.42 |
2.43 |
1.42 |
1.71 |
0.829 |
|
50x20 |
2.3 |
2.25 |
2.872 |
8 |
1.83 |
3.2 |
1.83 |
1.67 |
0.798 |
|
50x30 |
1.6 |
1.88 |
2.392 |
7.96 |
3.6 |
3.18 |
2.4 |
1.82 |
1.23 |
|
50x30 |
2.3 |
2.62 |
3.332 |
10.6 |
4.76 |
4.25 |
3.17 |
1.79 |
1.2 |
|
60x30 |
1.6 |
2.13 |
2.721 |
12.5 |
4.25 |
4.16 |
2.83 |
2.15 |
1.25 |
|
60x30 |
2.3 |
2.98 |
3.792 |
16.8 |
5.65 |
5.61 |
3.76 |
2.11 |
1.22 |
|
60x30 |
3.2 |
3.99 |
5.087 |
21.4 |
7.08 |
7.15 |
4.72 |
2.05 |
1.18 |
|
75x20 |
1.6 |
2.25 |
2.872 |
17.6 |
2.1 |
4.69 |
2.1 |
2.47 |
0.855 |
|
75x20 |
2.3 |
3.16 |
4.022 |
23.7 |
2.73 |
6.31 |
2.73 |
2.43 |
0.824 |
|
75x45 |
1.6 |
2.88 |
3.672 |
28.4 |
12.9 |
7.56 |
5.75 |
2.78 |
1.88 |
|
75x45 |
2.3 |
4.06 |
5.172 |
38.9 |
17.6 |
10.4 |
7.82 |
2.74 |
1.84 |
|
75x45 |
3.2 |
5.5 |
7.007 |
50.8 |
22.8 |
13.5 |
10.1 |
2.69 |
1.8 |
|
80x40 |
1.6 |
2.88 |
3.672 |
30.7 |
10.5 |
7.68 |
5.26 |
2.89 |
1.69 |
|
80x40 |
2.3 |
4.06 |
5.172 |
42.1 |
14.3 |
10.5 |
7.14 |
2.85 |
1.66 |
|
80x40 |
3.2 |
5.5 |
7.007 |
54.9 |
18.4 |
13.7 |
9.21 |
2.8 |
1.62 |
|
90x45 |
2.3 |
4.6 |
5.862 |
61 |
20.8 |
13.6 |
9.22 |
3.23 |
1.88 |
|
90x45 |
3.2 |
6.25 |
7.967 |
80.2 |
27 |
17.8 |
12 |
3.17 |
1.84 |
|
100x20 |
1.6 |
2.88 |
3.672 |
38.1 |
2.78 |
7.61 |
2.78 |
3.22 |
0.87 |
|
100x20 |
2.3 |
4.06 |
5.172 |
51.9 |
3.64 |
10.4 |
3.64 |
3.17 |
0.839 |
|
100x40 |
1.6 |
3.38 |
4.312 |
53.5 |
12.9 |
10.7 |
6.44 |
3.52 |
1.73 |
|
100x40 |
2.3 |
4.78 |
6.092 |
73.9 |
17.5 |
14.8 |
8.77 |
3.48 |
1.7 |
|
100x40 |
4.2 |
8.32 |
10.6 |
120 |
27.6 |
24 |
10.6 |
3.36 |
1.61 |
|
100x50 |
1.6 |
3.64 |
4.632 |
61.3 |
21.1 |
12.3 |
8.43 |
3.64 |
2.13 |
|
100x50 |
2.3 |
5.14 |
6.552 |
84.8 |
29 |
17 |
11.6 |
3.6 |
2.1 |
|
100x50 |
3.2 |
7.01 |
8.927 |
112 |
38 |
22.5 |
15.2 |
3.55 |
2.06 |
|
100x50 |
4.5 |
9.55 |
12.17 |
147 |
48.9 |
29.3 |
19.5 |
3.47 |
2 |
|
125x40 |
1.6 |
4.01 |
5.112 |
94.4 |
15.8 |
15.1 |
7.91 |
4.3 |
1.76 |
|
125x40 |
2.3 |
5.69 |
7.242 |
131 |
21.6 |
20.9 |
10.8 |
4.25 |
1.73 |
|
125x75 |
2.3 |
6.95 |
8.852 |
192 |
87.5 |
30.6 |
23.3 |
4.65 |
3.14 |
|
125x75 |
3.2 |
9.52 |
12.13 |
257 |
117 |
41.1 |
31.1 |
4.6 |
3.1 |
|
125x75 |
4 |
11.7 |
14.95 |
311 |
141 |
49.7 |
37.5 |
4.56 |
3.07 |
|
125x75 |
4.5 |
13.1 |
16.67 |
342 |
155 |
54.8 |
41.2 |
4.53 |
3.04 |
|
125x75 |
6 |
17 |
21.63 |
428 |
192 |
68.5 |
51.1 |
4.45 |
2.98 |
|
150x75 |
3.2 |
10.8 |
13.73 |
402 |
137 |
53.6 |
36.6 |
5.41 |
3.16 |
|
150x80 |
4.5 |
15.2 |
19.37 |
563 |
211 |
75 |
52.9 |
5.39 |
3.3 |
|
150x80 |
5 |
16.8 |
21.36 |
614 |
230 |
81.9 |
57.5 |
5.36 |
3.28 |
|
150x80 |
6 |
19.8 |
25.23 |
710 |
264 |
94.7 |
66.1 |
5.31 |
3.24 |
|
150x100 |
3.2 |
12 |
15.33 |
488 |
262 |
65.1 |
52.5 |
5.64 |
4.14 |
|
150x100 |
4.5 |
16.6 |
21.17 |
658 |
352 |
87.7 |
70.4 |
5.58 |
4.08 |
|
150x100 |
6 |
21.7 |
27.63 |
835 |
444 |
88.8 |
5.5 |
4.01 |
|
|
150x100 |
9 |
31.1 |
39.67 |
113×10 |
595 |
119 |
5.33 |
3.87 |
|
|
200x100 |
4.5 |
20.1 |
25.67 |
133x10 |
455 |
133 |
90.9 |
7.2 |
4.21 |
|
200x100 |
6 |
26.4 |
33.63 |
170x10 |
577 |
170 |
115 |
7.12 |
4.14 |
|
200x100 |
9 |
38.2 |
48.67 |
235x10 |
782 |
235 |
156 |
6.94 |
4.01 |
|
200x150 |
4.5 |
23.7 |
30.17 |
176x10 |
133x10 |
176 |
151 |
7.64 |
6.13 |
|
200x150 |
6 |
31.1 |
39.63 |
227x10 |
146x10 |
227 |
194 |
7.56 |
6.06 |
|
200x150 |
9 |
45.3 |
57.67 |
317x10 |
202x10 |
317 |
270 |
7.41 |
5.93 |
|
250x150 |
6 |
35.8 |
45.63 |
389x10 |
177x10 |
311 |
236 |
9.23 |
6.23 |
|
250x150 |
9 |
52.3 |
66.67 |
548x10 |
247x10 |
438 |
330 |
9.06 |
6.09 |
|
250x150 |
12 |
67.9 |
86.53 |
685x10 |
307x10 |
548 |
409 |
8.9 |
5.95 |
|
300x200 |
6 |
45.2 |
57.63 84.67 |
737x10 |
396x10 |
491 |
396 |
11.3 |
8.29 |
|
300x200 |
9 |
66.5 |
110.5 |
105x10 |
563x10 |
702 |
563 |
11.2 |
8.16 |
|
300x200 |
12 |
86.8 |
134x102 |
711x10 |
890 |
711 |
11 |
8.02 |
|
|
350x150 |
6 |
45.2 |
57.63 84.67 |
891x10 |
239x10 |
509 |
319 |
12.4 |
6.44 |
|
350x150 |
9 |
66.5 |
110.5 |
127x102 |
337x10 |
726 |
449 |
12.3 |
6.31 |
|
350x150 |
12 |
86.8 |
161x102 |
421x10 |
921 |
562 |
12.1 |
6.17 |
|
|
400x200 |
6 |
54.7 |
69.63 |
148x102 |
509x10 |
739 |
509 |
14.6 |
8.55 |
|
400x200 |
9 |
80.6 |
102.7 |
213x102 |
727x10 |
107x10 |
727 |
14.4 |
8.42 |
|
400x200 |
12 |
106 |
134.5 |
273x102 |
923x10 |
136x10 |
923 |
14.2 |
8.23 |
FAQ
Q: What is the minimum order quantity for KS D3568 structural tubing?
A: For KS D3568 structural tubing with standard outer diameters and wall thicknesses, the minimum order quantity is 5 tons per specification. For custom specifications, the minimum order quantity is typically 10 tons to ensure continuous production line operation and stable product quality.
Q: How long does it typically take from order placement to shipment?
A: In-stock specifications can be shipped within 3–5 days after receiving the deposit. For out-of-stock standard specifications, the production lead time is 7–15 days. Custom products are delivered within 15–25 days depending on the complexity of the process. We will provide photos or videos for confirmation before shipment.
Q: Can custom sizes and lengths be made? What is the process?
A: Yes, we can. Customers must provide detailed specifications for size, wall thickness, length, and quantity, preferably with technical drawings. We will provide a production plan and quotation within 1–2 business days. After confirmation, we will sign the contract, collect the deposit, and arrange production.
Q: What are your payment methods?
A: We accept international settlement methods such as T/T (typically a 30% deposit + 70% pre-shipment payment) and L/C. Long-term customers can request payment terms based on contract terms to facilitate capital turnover.
Q: What are your shipping options?
A: We offer ocean freight, LCL, rail, or direct truck delivery, depending on your location. We offer international trade terms such as FOB, CIF, and DAP. We assist with customs clearance and delivery arrangements, and provide complete documentation such as bills of lading and packing lists upon shipment.
Hainan Yuan Steel Pipe Supply Chain Co., Ltd is the top steel pipe stockist and distributor in China. Generally we hold steel pipe stock of at least 15000 tons per months with a sales about 30000 tons per month. In view of the special steel trade system in China, we are a major player in Chinese Steel market.
Your specific inquiry of KS D3568 Carbon steel structural steel tubes is highly appreciated.WELCOME TO inquiry for latest price.
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