Name: China ASTM A106 Grade B Seamless Pipe Specification Manufacturers Suppliers Factory - Shenzhoutong Steel Pipe
Brand: Shenzhoutong
SKU: 301760663

Specifications

ASTM A106 Grade B Seamless Pipe Specification：

Standard‌: ASTM A106/A106M (equivalent to ASME SA106M).

‌Grade‌: Grade B - offers higher strength and carbon content than Grade A.

‌Operating Temperature‌: Suitable up to ‌425°C‌, ideal for main steam lines and boiler systems.

Chemical Composition (Grade B)

Element	Content (%)
Carbon (C)	≤ 0.30
Manganese (Mn)	0.29–1.06
Phosphorus (P)	≤ 0.035
Sulfur (S)	≤ 0.035
Silicon (Si)	≥ 0.10

Mechanical Properties (Minimum)

Property	Value
Yield Strength	‌≥240 MPa‌
Tensile Strength	‌≥415 MPa‌
Elongation	≥ 21% (on 50mm gauge length)

Dimensions & Wall Thickness

‌ASTM A106 Grade B seamless steel pipe dimensions and wall thickness‌ are standardized under ‌ASME B36.10M‌, with sizes ranging from NPS 1/8″ to 48″ (DN6 to DN1200). Below is a representative ‌dimensional reference table‌ for common NPS sizes and schedules:

NPS (in)	DN (mm)	Outside Diameter (mm)	SCH 10	SCH 40 (STD)	SCH 80 (XS)	XXS
1/8	6	10.3	1.73	2.41	3.02	-
1/4	8	13.7	2.24	2.77	3.40	-
1/2	15	21.3	2.77	3.73	5.56	7.47
3/4	20	26.7	2.87	3.91	5.74	7.82
1	25	33.4	3.38	4.55	6.35	9.09
1.5	40	48.3	3.68	4.85	7.14	10.15
2	50	60.3	3.91	5.54	8.74	11.07
3	80	88.9	5.49	7.62	11.13	15.24
4	100	114.3	6.02	8.56	13.49	17.12
6	150	168.3	7.11	10.97	18.26	21.97
8	200	219.1	8.18	12.70	22.23	26.97
10	250	273.1	9.27	12.70	25.40	33.32
12	300	323.9	9.53	12.70	25.40	39.67
16	400	406.4	9.53	12.70	26.97	47.62
20	500	508.0	9.53	12.70	26.97	52.37
24	600	609.6	9.53	12.70	26.97	57.12

‌Notes‌:

All dimensions in ‌mm‌.

‌SCH 40‌ is standard for most general high-pressure applications.

‌XXS‌ (Double Extra Strong) wall thickness is typically available for NPS ≤ 12″.

Tolerances: OD ±1%, wall thickness -12.5% to +20%.

manufacturing process

ASTM A106 Grade B Seamless Pipe:

Step	Process Stage	Key Details
1	‌Raw Material Preparation‌	High-quality carbon steel billets (e.g., 20# steel) are inspected and cleaned to remove scale, rust, or impurities.
2	‌Heating‌	Billets are heated to ~‌1200°C‌ in a rotary furnace for uniform plasticity before piercing.
3	‌Piercing‌	Using a rotary piercer or mandrel mill to create a hollow "mother tube" by pushing the billet onto a mandrel.
4	‌Hot Rolling‌	The mother tube is rolled in automatic or continuous mills to reduce diameter and wall thickness with tight tolerances (±12.5%).
5	‌Sizing & Stretch Reducing‌	Pipes pass through sizing and stretch-reducing mills to achieve precise outer diameter and improved surface finish.
6	‌Cold Drawing (Optional)‌	For cold-drawn pipes: pickling, lubrication, and drawing through a die at room temperature for higher precision and strength.
7	‌Heat Treatment‌	‌Normalizing‌ at ‌900–930°C‌ followed by air cooling to refine grain structure and enhance mechanical properties.
8	‌Straightening & Cutting‌	Multi-roll straightening machines correct curvature; pipes are cut to standard lengths (6m or 12m).
9	‌Non-Destructive Testing (NDT)‌	100% ‌Ultrasonic Testing (UT)‌ and/or ‌Eddy Current Testing (ET)‌ for internal and surface defects.
10	‌Hydrostatic Test‌	Each pipe is tested at ‌1.5× design pressure‌ to ensure leak tightness and structural integrity.
11	‌Marking & Coating‌	Permanent marking (standard, grade, heat number); optional black paint or 3LPE coating for corrosion protection.
12	‌Packaging‌	Bundled with steel straps, end caps installed, and prepared for shipment.
13	‌Final Inspection & Certification‌	Sample testing (tensile, bend, impact); issuance of MTR, third-party reports (BV,TUV, SGS), and compliance documents.