45# A106 Gr.C STPG410 Carbon Steel Pipe | High Strength Mechanical Structure Tube

Medium carbon composition, high strength and hardness, excellent wear resistance
Supports quenching & tempering heat treatment to customize mechanical properties
Multi-standard equivalent grades, suitable for export machinery and equipment projects
High dimensional accuracy, suitable for subsequent turning and machining
Can be processed into shaft sleeves, cylinder tubes and other precision mechanical parts

Product Overview

45# medium carbon high-quality carbon structural steel pipe is a special grade for mechanical structure and load-bearing parts. Its international equivalent grades include **ASTM A106 Grade C and JIS STPG410**, which are widely used in mechanical manufacturing and high-load structural parts.

This pipe can be supplied in ERW welded or seamless type. It is produced in strict accordance with GB/T 699, ASTM A106 and JIS G3454 standards. Available diameter ranges from DN15 to DN300, with various wall thickness options. Standard length is 6m and 12m, and custom length can be provided. The pipe has good machinability, and can be subjected to quenching and tempering heat treatment to further improve strength and hardness according to application requirements.

45# / A106 Gr.C / STPG410 carbon steel pipe is mainly used for mechanical transmission shafts, gear sleeves, hydraulic equipment cylinder bodies, die accessories, high-load structural connectors and auto parts. We can provide secondary processing services such as heat treatment, turning, honing and cutting.

Carbon Steel Structure/Fluid Pipe

Chemical & Mechanical Property Snapshot

Grade	Standard	C (%)	Si Max (%)	Mn (%)	P Max (%)	S Max (%)	Yield Strength Min (MPa)	Tensile Strength (MPa)	Elongation Min (%)
45#	GB/T 699	0.42–0.50	0.37	0.50–0.80	0.035	0.035	355	600–750	16
A106 Gr.C	ASTM A106	≤0.35	0.10	0.29–1.06	0.035	0.035	275	485–655	25
STPG410	JIS G3454	≤0.30	0.35	0.30–1.00	0.040	0.040	305	410–610	20

Detailed Technical Specifications

Item	Specification
Product Name	45# / A106 Gr.C / STPG410 Carbon Steel Pipe
Material	Medium Carbon High Quality Structural Steel
Process	ERW welded / seamless optional
Applicable Standards	GB/T 699, ASTM A106, JIS G3454
Equivalent Grades	GB 45#; ASTM A106 Grade C; JIS STPG410
Nominal Pipe Size	NPS 1/2″ – 12″
Metric Diameter Range	DN15 – DN300
Common Wall Thickness	Schedule 40 / Schedule 80 / Custom
Standard Length	6m / 12m
Customized Length	Available, fixed length upon request
Pipe End Options	Plain end, beveled end, threaded end
Heat Treatment	Annealed, normalized, quenched & tempered optional
Processing Capability	Turning, honing, cutting, heat treatment
Typical Applications	Mechanical shafts, gear sleeves, hydraulic cylinders, die parts, high-load structural connectors, auto components
MOQ	5 Ton for standard sizes
Payment Terms	T/T, L/C at Sight
Delivery Time	10–15 working days after receiving deposit
Package	Waterproof paper + steel strap + seaworthy export wooden pallet / bundle

Pipe Shape Options Table

Shape Type	Abbreviation	Cross Section	Production Type	Main Application
Round Carbon Steel Pipe	CHS	Circular Hollow Section	Seamless / ERW Welded	Fluid transportation, pipelines, general structures
Square Carbon Steel Pipe	SHS	Square Hollow Section	Welded / Seamless	Building frames, machinery supports, construction structures
Rectangular Carbon Steel Pipe	RHS	Rectangular Hollow Section	Welded / Seamless	Steel structures, container frames, guardrails

Dimension Range Table

NPS	DN	ASME OD (mm)	SCH10 Wall Thickness (mm)	SCH20 Wall Thickness (mm)	SCH30 Wall Thickness (mm)	STD Wall Thickness (mm)	SCH40 Wall Thickness (mm)	SCH60 Wall Thickness (mm)	XS Wall Thickness (mm)	SCH80 Wall Thickness (mm)	SCH100 Wall Thickness (mm)	SCH120 Wall Thickness (mm)	SCH140 Wall Thickness (mm)	SCH160 Wall Thickness (mm)	XXS Wall Thickness (mm)
1/4″	DN6	13.7	—	—	—	2.77	2.77	—	3.73	3.73	—	—	—	4.78	7.47
3/8″	DN10	17.1	—	—	—	2.77	2.77	—	3.73	3.73	—	—	—	5.56	7.82
1/2″	DN15	21.3	2.11	2.11	—	2.77	2.77	—	3.91	3.91	—	—	—	6.55	9.09
3/4″	DN20	26.9	2.11	2.11	—	2.77	2.87	—	3.91	3.91	—	—	—	6.55	9.70
1″	DN25	33.7	2.77	2.77	—	3.38	3.38	—	4.55	4.55	—	—	—	7.82	11.07
1 1/4″	DN32	42.4	2.77	2.77	—	3.56	3.68	—	4.85	4.85	—	—	—	7.82	11.07
1 1/2″	DN40	48.3	2.77	2.77	—	3.68	3.91	—	5.08	5.08	—	—	—	7.82	11.07
2″	DN50	60.3	3.05	3.05	—	3.91	3.91	—	5.54	5.54	—	7.82	—	11.13	15.25
2 1/2″	DN65	76.1	3.05	3.05	—	5.16	5.16	—	7.01	7.01	—	9.53	—	14.02	17.12
3″	DN80	88.9	3.05	3.05	—	5.49	5.49	—	7.62	7.62	—	11.13	—	15.24	19.05
3 1/2″	DN90	101.6	3.05	3.05	—	5.74	5.74	—	8.08	8.08	—	12.70	—	15.24	19.05
4″	DN100	114.3	3.05	3.05	—	6.02	6.02	—	8.56	8.56	—	12.70	—	15.24	19.05
5″	DN125	139.7	3.40	3.40	—	6.55	6.55	—	9.53	9.53	—	12.70	—	19.05	22.23
6″	DN150	168.3	3.40	3.40	—	7.11	7.11	—	10.97	10.97	—	12.70	—	21.95	28.58
8″	DN200	219.1	4.19	4.78	—	8.18	8.18	10.31	12.70	12.70	15.09	18.26	20.62	23.01	22.23
10″	DN250	273.0	4.57	6.35	—	9.27	9.27	12.70	12.70	15.09	18.26	21.44	25.40	28.58	25.40
12″	DN300	323.8	6.35	6.35	—	9.53	10.31	14.27	12.70	17.48	21.44	25.40	28.58	33.32	25.40
14″	DN350	355.6	6.35	7.92	—	9.53	11.13	15.09	12.70	19.05	23.83	27.79	31.75	35.71	—
16″	DN400	406.4	6.35	7.92	—	9.53	12.70	16.66	12.70	21.44	26.19	30.96	34.93	38.89	—
18″	DN450	457.0	6.35	7.92	—	9.53	12.70	19.05	12.70	23.83	28.58	34.93	38.10	46.02	—
20″	DN500	508.0	6.35	9.53	—	9.53	12.70	20.62	12.70	26.19	32.54	38.10	41.28	52.37	—
22″	DN550	558.8	6.35	9.53	—	9.53	12.70	22.23	12.70	28.58	34.93	41.28	44.45	59.54	—
24″	DN600	609.6	6.35	9.53	—	9.53	12.70	24.61	12.70	30.96	38.10	44.45	50.01	59.54	—

Product Comparison Table

Grade Level	GB Grade	ASTM Equivalent	EN Equivalent	JIS Equivalent	Key Feature	Typical Application
Low Carbon General Grade	Q195	A53 Gr.A	S195T	STK400	Low carbon, excellent formability & weldability	Light structures, low-pressure fluid pipes, scaffolding
Medium Strength Structural Grade	Q235B	A36 / A53 Gr.B	S235JR	STK490	Balanced strength & weldability, most widely used	Building structures, general fluid pipes, support frames
High Strength Structural Grade	Q355B (Q345B)	A53 Gr.B	S355JR	STK490	High tensile strength, low alloy	Heavy structures, mechanical equipment, medium-pressure fluid
Seamless Fluid Grade	20#	A106 Gr.B	P265GH	STPG370	Fine grain, good high temperature performance	Seamless fluid pipes, boiler pipes, heat exchangers
High Strength Mechanical Grade	45#	A106 Gr.C	—	STPG410	High hardness, good wear resistance	Mechanical shafts, high-load structural components

App Market

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Product Packaging

Secure Export Packaging For Safe Handling And Delivery

FAQs

What is 45# steel pipe usually used for?

45# carbon steel pipe is mainly used for mechanical structural parts such as transmission shafts, gear sleeves, hydraulic cylinder bodies, die accessories and high-load connectors.

Can 45# steel pipe be heat treated?

Yes. 45# medium carbon steel supports quenching and tempering heat treatment to improve strength and hardness according to application requirements.

Is 45# equivalent to A106 Grade C?

They are similar in strength level. 45# has higher carbon content and hardness, more suitable for mechanical structure; A106 Gr.C is more for high pressure fluid service. They can be substituted after engineering verification.

Can you provide honed cylinder tube?

Yes. We can provide honing, boring and other precision machining services for 45# steel pipe to produce hydraulic cylinder tubes.

What is the MOQ for 45# carbon steel pipe?

The MOQ is 5 tons for standard sizes. Small batch orders for mechanical processing can be negotiated.

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45# A106 Gr.C STPG410 Carbon Steel Pipe | High Strength Mechanical Structure Tube